Two battery electric bike
Electric pedal-assisted bikes, also known as E-bikes or electric bikes, offer a spectrum of benefits for different kinds of rides and riders, and aim to break down barriers that prevent us from taking longer, faster rides. Each E-bike in our lineup has a pedal assist motor that runs on a frame-integrated, rechargeable battery. One question we get all the time is: how long will my E-bike battery last on one charge? The not-so simple answer: It depends. We know, WE KNOW: that’s not that helpful, but hear us out. There are a lot of factors that affect just how far your battery will last, and once you understand them, you’ll be better at estimating how many miles you have before you need to recharge.
But, before you can get a clear picture of how to maximize your E-bike battery life, you’ll need a quick run-down of the technology that goes into making your E-bike… well… go. For everyone’s sanity, we tried to put our tech jargon into simple terms here. Read on for detailed descriptions of each model of battery and motor, and how they interact on your bike.
Liv’s Four Battery Options
Our E-bikes are built with one of three batteries that power the motor: the EnergyPak Smart, the EnergyPak Smart Compact, or the EnergyPak Side Release. Also available is the EnergyPak Plus, a small backup battery. All four rechargeable batteries detach from the frame and can be plugged in either on or off the bike, depending on how accessible your outlet is.
The strength of each battery is measured in watt hours (Wh)—a unit totally different from watts, which many cyclists use to measure their own power output at any given moment as they ride. But mainly: The higher the watt hour of your bike’s battery, the more power it can hold.
The EnergyPak Smart is the highest-capacity battery available for our E-bikes, ideal for long, intense rides where you’ll be using a large amount of pedal assistance or encountering a lot of loose gravel, snow, mud, or other unpaved terrain. The slim, streamlined battery is integrated right into the frame of the bike for a clean look and feel. It comes in three different watt hour (Wh) versions: 625, 500, and 400 (if the bike you buy comes with the 400 or 500 Wh battery, it’s compatible for an upgrade). All three Wh levels of the battery charge from dead to 80 percent in under three hours.
The EnergyPak Smart Compact is our 500 Wh electric road bike battery, which has the sleekest profile designed to help your E-bike blend in with a fleet of non-electric road bikes. Both the EnergyPak Smart and EnergyPak Smart Compact have aluminum casing to help prevent overheating, for both safety and battery-life extension purposes.
The EnergyPak Side Release comes on many of our commuter E-bikes and entry-level electric mountain bikes, shaped specifically to fit into step-through models. It’s available in 500 Wh and 400 Wh and slides into the side of the downtube, rather than removing from the bottom the previous two batteries listed. EnergyPak side release’s waterproof rating is IPX5, slightly less than the rest of Liv’s batteries (IPX6, which can withstand a bit more pressure).
If you’re taking an extra-long trip where you might need extra battery life before you reach a place you can recharge, the EnergyPak Plus, a 250 Wh backup battery, is available. It’s small, lightweight, and can be mounted directly to your downtube to add more miles to your ride. It charges relatively quickly, up to about 80 percent capacity in just two hours, so you can change up your main battery and this one in a single evening.
Liv’s Three Motor Options
Our E-bikes have a motor located near the bottom-bracket that gives you assistance in turning the pedals, also called pedal assist. The three motors were developed in cooperation with Yamaha, and includes the SyncDrive Pro, the SyncDrive Sport, and the SyncDrive Core. All three motors are equipped with multiple sensors that detect even the slightest change in your cadence, power input, and speed. This allows the motor to blend the assistance it’s giving you into your pedal stroke in the most natural way possible; it engages smoothly and gradually, increasing input to match yours. Our E-bikes are designed to emphasize and support your own power and fitness, so there is no throttle you can push to make it go. You have to pedal—but how hard you pedal is up to you.
Our top-end E-bike come with the SyncDrive Pro. It’s the most powerful motor with the fastest engagement, meaning it feels the most touchy of the three, so it’s great for intense bursts of power to get through tricky uphill sections or steep punchy climbs on a mountain bike. The highly sensitive motor engages even if you’re pedaling super lightly and quickly (up to 170 rpm).
The SyncDrive Sport motor comes on most of our mid-priced bikes, and offers a less-punchy engagement than the Pro. Since it’s more conservative with its power, it tends to use less battery over time than the high-powered Pro as well.
The SyncDrive Core is the lightest-duty motor that comes on many of our E-commuter, and entry-level E-mountain bikes. It offers the smoothest engagement with the most gradual increase of assistance, so it is the most battery-conserving option of the three. And—bonus—it’s also the quietest.
Everything you need to know about e-bike batteries [from a battery engineer]
Would you be the person taking the stairs or the escalator?
I’ll be honest. barring the one-off day that I’m feeling particularly sprightly, I would just hop on the escalator with those 30 people on the right. And I’m willing to guess that most of you would too.
What we can gauge from this picture is that most people would rather do as little work as possible to get from point A to point B. This is especially true when it comes to commuting on a bike. The picture above is analogous to the difference between a regular bike and an e-bike.
Even if we address all the concerns when it comes to biking in a city (like safe biking infrastructure), we can’t expect to change fundamental human behavior. when given the option between less work or more work to achieve the same outcome, people will more likely choose to do less work.
Since getting my e-bike, I can comfortably bike from my home in Somerville to the Seaport district in Boston. a roughly 5-mile trip. in just about 20-minutes. All of a sudden, biking 5-miles is a piece of cake. I also don’t have to spend time sitting in traffic, waiting for public transit, or worry about showing up to a meeting looking like I swam across the Charles river to get there.
The beauty of an e-bike is that it makes cycling an inclusive mode of transportation because it doesn’t discriminate by age or physical ability.
When it comes to purchasing an e-bike though, there are a plethora of options for both the bike and battery. So how do you decide which one is best for your needs? As a battery engineer who has built hundreds of batteries and logged way too many hours soldering battery packs, here are my thoughts on the most commonly asked questions when it comes to e-bike batteries.
If you’re new to battery terminology, you might want to start here: Battery terms that every e-bike owner should know.
In this post, we’ll cover the following questions:
What is the best e-bike battery?
This is one of the hardest questions to answer. There are so many variables that go into what makes a good battery and what’s best for you, may not be the best for me. Even then, a good battery can perform poorly if it’s not cared for properly.
Battery packs are made up of individual battery “cells”. Cells are classified into cylindrical cells (like your AA and AAA) and prismatic cells (like the one in your phone). Each class of battery is manufactured in a variety of form-factors (in the battery world we use this term to mean size). The most commonly used form-factor of cells in an e-bike battery pack is the 18650.
A battery pack is only as good as it’s weakest cell.
When it comes to batteries, in my experience, there is a strong correlation between price and quality. I don’t follow this rule when it comes to most things like for example, box wine (I’m just saying, there are plenty of really good box wine options these days!). When it comes to batteries though, you really don’t want to be compromising on quality because you’ll eventually end up having to pay the price.
Here are some things to keep in mind when purchasing an e-bike:
Cell Manufacturers: Panasonic, LG, and Samsung have a good reputation in the battery industry for their high quality cells, so paying a premium for these cells is certainly worth it. If the e-bike you’re trying to buy doesn’t have or provide cell manufacturer information, they’re likely not going to be a reliable source anyway.
Cell Chemistry: Lithium-ion (li-ion) batteries are the best option for e-bikes. Although lead-acid batteries are significantly cheaper, they’re three times as heavy as their li-ion equivalents.
Li-ion has several variants of cell chemistry. The most popular ones for e-bikes are Nickel Manganese Cobalt (NMC), Lithium Cobalt Oxide (LCO), and Lithium Iron Phosphate (LFP). The metrics to look for when selecting a cell chemistry are:
- Specific Energy: has an impact on the range of your battery.
- Specific Power: how the battery handles high load scenarios like going up
- a hill.
- Safety: does the chemistry have a history of high in-field failures.
There are trade-offs when choosing one chemistry over another, but as we’ve shown in the image below, NMC and LFP are both great options that both offer the best value in terms of performance, price, and safety.
Picking the right battery chemistry has to do with figuring out what matters most to you. Do you want a battery that has a longer range (higher specific energy) but doesn’t have as much power? Or do you want a battery that has a more power (higher specific power) but may not last as long?
In my opinion, the best e-bike batteries are likely going to be made from cells manufactured by Panasonic, LG, or Samsung with either LFP or NMC cell chemistry.
What is the range of an e-bike battery?
The range of a battery pack depends on the amount of energy packed inside of it and is measured in Watt-Hours (Wh). Watt?
Watt-hours are calculated by multiplying the battery capacity, in Amp-hours, by the battery Voltage, in Volts.
Let’s assume that, on average, 1-mile requires about 25Wh of energy. So a 14Ah, 36V battery should get you about 25-miles per charge.
Keep in mind that the weight of the rider, outside temperature conditions, and the amount of pedaling will make a significant difference in range.
A word of caution: the range that e-bike manufacturers provide should be taken with a grain of salt. That number is generated from tests that are run in perfectly tailored lab conditions. Do you charge any of your electronics in an incubation chamber set at 28° C with a lab-grade charger that applies the perfect current while charging? Yeah, I don’t either. And so, We should assume that the manufacture-specified range is delivered only if the battery is charged and discharged under ideal conditions i.e. not real world conditions.
For a more realistic estimate, shave off 15% of the manufacturer specified range and assume this padded number to be your real range.
If you’re looking for a longer range, choose a battery that has higher capacity (Ah). If you’re looking for more power, choose a battery that has higher voltage (V). Learn more why voltage and capacity matter.
What is the lifespan of an e-bike battery?
There are several factors that affect the lifetime of a battery such as:
- environmental conditions: temperature during charging discharging
- charging rate: how fast or slow your battery is charged
- charging voltage: what voltage the battery is charged to
- depth of discharge (DoD): what voltage the battery is discharged to
The list above isn’t exhaustive but, in general, batteries decay as a function of time in the charged state. Period.
Day 1: You get your new e-bike and charge it up to 100% and go on a bike ride. When you come home, you charge the bike back up to 100% and you’re excited to ride it again soon.
Day 2. 364: Life get’s in the way and you still haven’t been out on your bike since that first ride.
Day 365: One year later, it’s the perfect day for a bike ride and you finally have some time on your hands. You head to your basement, unlock your bike, and excitedly turn it on. 80% charge. What? You clearly remember charging your bike to 100% last year before moving it to the basement!
The truth is, we can’t beat thermodynamics. I’ll say it again: batteries decay as a function of time in the charged state.
Now, because you left your battery at 100% for a whole year in a basement with no temperature control, you inadvertently caused your battery to lose a certain amount of irreversible capacity. Your range will be ~20% lower and you’ll likely have to replace your battery sooner than you expected. The table below shows you how much recoverable capacity exists in a battery after storing it at different temperatures and different charge states for 1-year.
This is why a lot of electronics come with batteries that are only partially charged. to help slow down this decay. That being said, it’s hard to track how long e-bikes and their batteries have been sitting in warehouses before being delivered to your door so you could get a battery that has been decaying for a year or two.
Manufacturers also tend to overrate their batteries and will make claims about certain batteries having a lifetime of at least 1,000 cycles. Show.me.the.data.
The lifetime of a lithium-ion battery is described as the number of cycles until the capacity (Ah) drops below 80% of it’s initial capacity. In general, this is roughly 250-400 cycles (depending on battery chemistry and other factors) which amounts to roughly 1.5 to 2 years if you charge discharge daily and care for your battery properly.
How to charge your e-bike battery to make it last longer
- The thing that will kill your battery faster than anything else is leaving it charged at elevated temperatures. If it’s 80 degrees outside and you have your e-bike fully charged, move it indoors where it’s cooler and try to drain the battery as soon as possible.
- Charge your battery at room temperature as often as possible.
- When sourcing an e-bike battery charger, the slower the charge rate the better. For example, if you have a 2-Amp charger, and your battery is a 14 Ah battery pack, you are charging at 14 Ah / 2-Amps = 7-hours. This is a nice, slow charge which will certainly improve the longevity of your battery pack. Avoid charging at rates that are faster than 2-hours for a full charge.
There’s a lot that goes into choosing the best battery for you e-bike, and there certainly isn’t a one-size-fits-all approach. But if I were buying an e-bike battery today, here’s what I’d do: LFP or NMC, slow charge, avoid storing or charging in hotter temperatures, and leave the battery at around 30% charge if you don’t plan on using it for a while.
Have questions? We’d love to help. You can get in touch using the contact form or find us on @somerville_ev
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Overview of Dual Battery Solution and Range Extender Battery
Some e-bike riders need a longer range for their e-bike. The mtb user wants to have more fun on the dirt roads or e cargo bikes users need to carry more goods for long rides. What would be the perfect solution for them to have a range boost for their e-bike? Dual battery and range extender?
Discover more about dual battery solutions from LEV battery manufacturer.
What are Dual battery system types？
There are two dual battery setup types: parallel (dual battery) and power bank (range extender). The main difference between them is how they operate as well as how much power each type can produce.
Choose and click to discover more about dual battery products.
Both types were designed to solve a problem, but it came down to personal preference for those who purchased e-bikes equipped with two e-bike batteries or range extender batteries.
The parallel battery type
We have the battery control unit fully integrated with the BMS. It will optimize the use of both batteries and keep them at the same voltage when they are connected. With two batteries in parallel, the output voltage is the same as one battery, but the amp hours are doubled.
This way allows both battery discharge at the same time and has twice the range or power of a single battery. It increases the total capacity directly.
Another way is having only one battery power the e-bike, and automatically switch to the second battery when the first one is out of power. Also, it can be switched manually as well. Each battery in a dual battery system can power the motor independently.
Both ways can give riders more battery capacity and more range for a smooth ride. For dual battery system, it will also improve the acceleration of your e-bike.
Advantages of an e-bike Dual battery
A dual battery system offers several advantages over just one battery system. This is especially important for those who want to ride their electric bikes for long distances.
The dual battery system is a more permanent solution. Once it’s installed, it will be there as long as riders own the specific bike. In other words, riders can FOCUS on the riding experience without worrying about the charge level or when to recharge the battery. With eco mode, riders can have even longer rides.
For example, dual battery systems can provide longer run times, more power, and greater flexibility. The Bosch dual battery system is a great example.
They can also be used to store energy from solar or wind systems, providing a backup power source in the event of an outage. Dual battery systems are the best option for those who want the most from their e-bike.
Disadvantages of a Dual battery system
A dual battery system has a few disadvantages.
First, it can be more expensive than a single battery system, because you need to purchase an extra battery.
Second, it can be more complicated to install and design. And require a spare battery control unit or fully integrated with BMS.
Finally, it can add additional weight to the e-bike, which can affect performance.
However, these disadvantages are outweighed by the many advantages of dual battery systems.
The range extender type
The range extender is a second battery, that is plug-in with the main battery. When the main battery is getting low, the range extender battery can start to charge the main battery. It works as a “power bank”.
The range extender battery usually has a smaller capacity than the main e-bike battery. When the main battery is drained, the range extender battery will start to power charge the main battery. Some systems may require the e-bike to stop when charging the range extender battery.
Advantages of a range extender battery
Riders will not need to modify their e-bike or dual battery system. Just mount it on the down tube or top tube. Even can work in their backpack.
Also, thanks to the smaller capacity and size, it is easier to carry with riders in their backpack. While riders check the view or take a lunch break, it will start charging. After that, they can take the ride again.
It is affordable, easy to use, and a readily available way to increase ride quality.
Disadvantages of a range extender
Just as with any other product on the market, there are a few disadvantages that come with using a range extender battery. Depending on your needs, it may or may not be a major drawback.
The main disadvantage of the range extender battery is that you will have to keep charging two batteries separately, which can quickly become tedious and time-consuming if they’re drained at different times.
Another issue with the range extender is the charging rate. Because it works as a power bank, it usually takes the same amount of time to fully charge your main battery as using the normal charger. If you are doing a lot of climbing with your e-bike, the range extender may not have enough power to keep up.
The last part is if the main battery is dead, the range extender may not power your e-bike directly.
Despite these few disadvantages, the range extender battery is still a great option for those who want to extend the range of their e-bike.
Which Dual or Range extender battery type should riders choose?
There are advantages and disadvantages for both dual/range extender battery types which will depend on your product preference as well as what you plan on designing the electric bike for.
The best thing that can do is to test out different dual/range extender bikes to see how they feel while riding them because it may come down to comfort rather than what looks cool or has more power output.
Also, don’t forget about the price! Even though it might look like dual batteries are the way to go, you may find that a range extender battery might be compatible with your existing product line.
The future of electric bikes
The dual battery system (two parallel batteries or battery range extender) has the potential to take electric bikes into the next generation. This system provides both high power and extended range, which is what you need for an e-bike to become your primary mode of transport. This means that in the future there may be more e-bikes with dual battery systems than those using a single battery.
The dual-battery system is not only more powerful, but it is also easy to maintain and service. This means that there is less chance of a breakdown.
And you will spend less time and money on repairs. So overall, the dual-battery system provides many advantages – making it the better option for your e-bike.
Range extender with Smart BMS. It works as a power bank and can work with many popular systems and recharge your main battery.
It has 180 watt-hours of energy and supports up to a 3A discharge rate as a power bank. A suitable solution for your current product line. It is perfect to place on the bike down tube or water bottle holder. Easy fit in different frame sizes.
Tritek also provides a dual battery setup. With our new BMS battery technology, it can safely switch or parallel. The frame battery’s low-weight design can increase range without too much additional weight.
Dual battery systems are the best option for those who want the most from their e-bike. Compared to a range extender battery, dual batteries offer longer run times, more power, and greater flexibility.
However, depending on your needs and riding style, they may not be a deal-breaker. If you have any other questions about dual-battery for e-bikes or range extenders, feel free to contact us for further information.
Thank you for reading! We hope this article has helped inform you about the advantages of dual-battery E-bikes. Stay safe and have a great ride!
These are the longest-range electric bicycles money can buy right now
Some things in the universe are constant. Gravity, the slow march of time, and the same three questions that every new electric bike owner will get from friends, family, and strangers. Those questions are always “How fast is it?,” “Does it pedal when you charge it?,” and the most difficult of all to answer, “How far does it go?”
The range that any e-bike gets is a tricky question to answer because it depends on how the e-bike is used. Two e-bikes with the same size batteries could get very different ranges depending on whether the rider is pegging the throttle or taking a chill ride on low-power pedal assist.
It’s like how if I gave you a food allowance of 100 and asked how long you could survive, the answer would be different depending on if you ate at Red Lobster or sustained yourself on ramen and tap water.
In the same way that it’s better to judge that question by your food budget and not how you spend it, it’s easier to compare long-range e-bikes based on their battery capacity (measured in watt hours or Wh) than by the manufacturer’s stated maximum range.
So with that in mind, let’s take a look at the longest-range electric bicycles on the market today, judged not just on their stated maximum ranges, but also on their battery sizes.
FUELL Flluid 2
The Flluid-2 is described as an “ultra-long-range powerhouse” with its two removable battery packs totaling 2 kWh of capacity. That doubles the battery capacity of the first-generation FUELL Flluid-1 and enables an impressive range of up to 225 Mi (362 km) on a single charge.
The company also released an easier-to-mount step-through option known as the Flluid-3. That bike offers a single 1 kWh battery that should be enough for anyone that can live with a still-impressive 110 Mi (177 km) range. But for those seeking serious range, it’s the Flluid-2’s dual 1 kWh batteries that are worth taking a second look at.
Both models offer throttle-enabled 750 W continuous-rated Valeo mid-drive motors, though the throttle is limited to just 6 km/h or 3.7 mph in Europe for regulatory compliance. The motor will also carry a 250 W rating in Europe, though both the EU and US versions are listed at 130 Nm of torque, making the motor one of the strongest mid-drives available on retail e-bikes.
Optibike R22 Everest
Colorado-based Optibike is one of the oldest electric bicycle companies in the United States, and so they know a thing or two about building high-performance e-bikes. But the company’s Optibike R22 Everest seems to step it up several notches with an e-bike that supposedly can climb Mount Everest on a single charge thanks to its massive battery pack.
Just how much battery does an R22 pack into its carbon fiber frame? There’s an impressive 3,260 Wh of lithium-ion cells stuffed into the bike. The battery is designed in two packs that are removable from either side of the frame.
To put that in comparison, 3.26 kWh of battery is more than 6x the capacity of a common low-cost electric bicycle in the US.
Of course, the 18,900 R22 Everest also costs around 27x the price of that 799 low cost e-bike, so I’m not sure these things track linearly. But if your goal is to climb up Mount Everest on an e-bike, price probably isn’t your first concern. If it were me, riding across those ladders might be higher on my “big worries” list.
Watt Wagons HOUND
Watt Wagons, a US-based manufacturer of high-power and high-end electric bicycles, has a new model designed for serious off-roaders and adventurers. In fact, the Watt Wagon HOUND has several keys specs that sound almost foreign in the electric bicycle industry, such as a 200-mile range and built-in chargers compatible with electric car charging stations.
The Watt Wagon HOUND is actually available in two models, the base model and the “Supercharged” model. It’s the Supercharged model that you’ll want for the extra-long range.
While the base level HOUND has a respectable 52V 17Ah battery with 884 Wh of capacity for a real-world throttle range of 30 miles (51 km) and a pedal assist range of 80 miles (130 km), according to the company, the Supercharged model more than triples the battery capacity.
The massive battery on the higher-spec model is a gargantuan 52V 60Ah pack with 3,210 Wh of capacity. The company claims you’ll get 100 solid miles (160 km) on throttle-only riding or 200 miles (320 km) on pedal assist.
And not only do you get a massive battery, but you also get both a 52V 5A fast charger and an EV charger with a J1772 connector, giving you multiple options for quickly recharging that big battery. Not too shabby!
Some companies like Watt Wagons above use a single massive battery to create long-range e-bikes. Other companies simply slap on more and more individual batteries to reach higher total capacities. The EUNORAU Flash offers up to three batteries for riders that want the ultimate in long-range possibilities.
With its three large batteries, EUNORAU claims that this electric bike can have you cruising for up to 220 miles (354 km) on a single charge.
Fully maxed out, that means riders can have up to 2,808 Wh of total battery capacity across the three packs.
They leave the bike looking a bit overladen, but it’s an effective way to increase the bike’s range!
Juiced HyperScrambler 2
The Juiced HyperScrambler 2 is on its way to being sunsetted after a trademark dispute, but it is expected to be replaced by a similarly specced bike under a new name. And if the specs remain the same, that means it will come with the same pair of 52V 19.2Ah batteries for close to 2,000 Wh of total capacity.
The bike has a number of other impressive specs, too. It features a 1,000W Retroblade motor with a peak power output of 2,000W and a maximum speed (in unlocked mode) of a published “30 mph.” The true top speed has been shown by numerous riders to actually reach closer to 35 mph (56 km/h).
The HyperScrambler 2’s pair of high-capacity batteries are still one of its biggest claims to fame, ensuring that the power-hungry motor and controller can go the distance. In fact, that distance is listed as 100 miles (160 kilometers) of range per charge.
Even just one of the 52V 19.2Ah batteries on the HyperScrambler 2 offers more capacity than most other e-bikes, coming in at 998 Wh per battery. But the pair of them pushing close to 2,000 Wh is one of the highest-capacity battery load outs we’ve ever seen on a moped-style electric bike.
Electric Bike Company Model J
The Newport Beach, California-based Electric Bike Company recently launched its newest e-bike, the Model J. Not only did the launch reveal some impressive specs and massive battery capacity, but the introductory pricing bordered on unbelievable.
The Model J rolled out with an MSRP of 1,499 and an even more impressive pre-order price of just 1,199, though with a five- to six-week wait for delivery. Even without the promotion, 1,499 is a very fair price. But at 1,199, that makes this bike a steal.
That’s especially true when you consider how customizable the bike is, offering dozens of custom paint colors and thousands of color combinations, not to mention the three 48V batteries options to choose from: 14Ah (672Wh), 28Ah (1,344Wh), and 42Ah (2,016Wh). Those three batteries options offer maximum ranges on pedal assist of 65 miles (104 km), 130 miles (208 km), and 195 miles (314 km). All of the batteries even come with a five-year warranty, which is one of the longest battery warranties we’ve ever seen in the e-bike industry.
We’re excited to test a Model J soon and see if the awesome design and specs look and feel as good in real life as they appear on paper.
long-range e-bikes on the horizon?
These are some of the longest-range electric bikes we’ve seen anywhere, but that doesn’t mean that e-bike companies have stopped innovating.
We fully expect to see even longer-range models with even higher capacity cropping up in the coming months and years.
How far can the industry go? If these models are any indication, the sky is the limit!
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