Everything you need to know about e-bike batteries from a battery engineer. Lifepo4 ebike battery

Everything you need to know about types of e-bike batteries, battery life and how to take care of your battery

When purchasing an electric bicycle, the battery is one of the most important components. The battery determines how long the bicycle can be used without recharging, the distance it can travel, and how heavy and/or light it weighs.

It’s also one of the most expensive parts, so be sure to pay attention to the battery when you’re making an e-bike purchase.

A Guide to Electric Bike Batteries

Finding a good battery determines how far you can travel on a single ride, and varying sizes and weights have different degrees of speed and efficiency.

Without a battery, an electric bicycle is just a regular bicycle.

Let’s take a look at at the various options:

Lead (gel) batteries

Used less and less frequently over the years, lead batteries have a lower capacity (or amount of energy that can be stored in the battery), and take between 8-10 hours to fully charge.

For perspective, newer batteries can charge from empty to full in under three hours. Lead batteries also tend to weigh heavier than newer predecessors, meaning that bicycles powered by lead batteries are heavier in general.

Lead batteries are also cheaper to manufacture due to the quality of materials, and lower use capacity which is why they’re gradually being replaced in the marketplace.

Lithium-ion battery (Li-ion)

Newer or recent e-bikes will have some kind of lithium-ion battery as they are the most popular battery currently on the market.

Lithium-ion batteries optimize for both total weight and energy, giving you the best range and longevity to any other battery.

Li-ion battery types can also be molded into different shapes or unique spaces, making them ideal for high capacity and low power applications.

Lithium-ion batteries are made of various formulas — including cobalt, manganese or others — but there is no expert opinion to prove that one mix is significantly better than the other.

What’s most important is to buy a bike with a high-quality electric drive system and well-made parts to ensure against overheating and battery life over time.

What makes RIDEL special is its consideration of battery weight and size, while also optimizing for sleek design.

need, know, e-bike, batteries
  • The SNUGGER features a lightweight, long-lasting 48V 13Ah lithium battery containing an integrated backlight, so you can instantly check how much charge is left, day or night.
  • The EKO features an integrated 36V 250W battery built into the frame’s down tube – a Smart solution that gives you a more balanced center of gravity.


Lithium iron phosphate (LiFePO4) operates across a wide temperature range, making it a viable option for various applications or weather conditions. Its advantages include a longer life span, charge efficiency, no maintenance, extreme temperature operation and an ability to charge quickly.

As these batteries are relatively new in the market, they’re not the cheapest, but due to its long life span they are a Smart investment over time.

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.

need, know, e-bike, batteries

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.
need, know, e-bike, batteries

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

Also, subscribe below for alerts on our next post to learn more about batteries!

Lectric XP Spare Battery

NOTE: Riders should become familiar with their average battery use based on typical weight load, terrain, weather, and other conditions.

Product Specifications:


Note: Battery Charger sold separately or with a purchase of an eBike

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Veterans Input.

The spare battery works good it helps me get back and forth to my part-time job. I am disabled veteran and this is my main source of transportation. It gets me to and from my medical appointments and therapy it has been an immense help to spare battery and the whole bike itself.

Lectric 2.0

This bike is amazing, I have over 4,000 miles on it in one year. I have changed the tires twice from being worn and I get a good price from the company on tires and tubes. I drive the bike to work and back. I have saved a lot of gas since then. The bike gets me 27 miles an hour. With a little pedaling I do an average of 50 miles a day.

What is the longevity of a battery

I am a happy owner of an early XP 1.0. I currently have 1,120 Mi on original battery. The first 800 plus was city riding paved roads the last 300s have been on dirt roads out in the country. How much longer you think it might be before I truly need a new battery? in the country on a dirt roads I’m getting 10 to 15 miles. City I was getting 20. and originally I was getting close to 50 with pedaling losing weight

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ProdecoTech E-bike Battery Cell Replacement

Posted on February 07 2018

Does your ProdecoTech e-bike need a battery upgrade? Don’t pay for a brand new one, just send us yours and we’ll rebuild it with fresh, new lithium ion cells! We can take care of LiFePO4 pack that comes with select Phantom, Outlaw, Oasis, and Mariner models. For pricing information, see our ProdecoTech battery rebuilds page.

It doesn’t matter what form factor your battery has or which model Prodeco bike. This skinny rear rack pack comes on various Phantom, Genesis, Mariner, Island, and Stride models. We can typically upgrade these to 36V 14Ah.

These integrated downtube that’s on a number of Phantom, Rebel, and Genesis e-bikes. We can usually upgrade these to 36V 17.5Ah.

If you want us to replace your battery cells and upgrade your pack so you can ride longer, fill out our Battery Intake Form or contact us for more information!

116 Комментарии и мнения владельцев

Prodeco Tech in Florida agreed to replace my failed Samsung battery in April 2019, but kept my old battery and never replaced it. can you get me a reconditioned battery?

@Mitchell – We’d be happy to rebuild and upgrade your battery for you. Our current pricing can be found here: https://ebikemarketplace.com/products/prodecotech-e-bike-battery-replacement?variant=7418428194846

I have Samsung 36.3 v 10 ah like your picture, Prodeco Marnier small fold up. Will not take charge. Fix or can you replace

@Richard – We don’t stock replacements, but we’d be happy to rebuild and upgrade your battery if you send it in to us! https://ebikemarketplace.com/products/prodecotech-e-bike-battery-replacement

@Michael – We’d be happy to rebuild and upgrade your battery for you! https://ebikemarketplace.com/pages/battery-intake-form

I have a Prodeco Phantom X2? The battery will not charge. Can you do a rebuild or sell a replacement? Cost? Thanks!

@Robert – We’d be happy to rebuild and upgrade your battery for you: https://ebikemarketplace.com/products/prodecotech-e-bike-battery-replacement

I have a Prodeco Stride 500 Not sure of the year, At least 10 years old. The battery pack slips in from the rear of the bike. My manual says the battery is a 38.4V9ah-LIFEPO4-Prodeco Technologhies-V121-Prismatic Phosphate Polymer Cell. Can you rebuild this for me? Bob Roberge

@Cori – Our current pricing can be found here: https://ebikemarketplace.com/products/prodecotech-e-bike-battery-replacement?variant=7418428194846

I have a Prodecotech stride with the Samsung battery it will not accept a charge. What do you charge to rebuild the battery?

Ladies and Gentlemen. I first bought a Genesis 500 W in September 2012. The battery is getting tired, and I need information how to re cell the lithium battery or get a new one. please let me know. David Mourey 492 Church St. Cleveland, Ga. 30529 cell 706 809 2890. Waiting to hear from you.

@Bruce – We’d be happy to rebuild and upgrade your battery for you. https://ebikemarketplace.com/pages/battery-intake-form

@Dave – We’d be happy to rebuild and upgrade your battery for you: https://ebikemarketplace.com/products/prodecotech-e-bike-battery-replacement

I need a replacement battery on a Prodeco phantom X old battery was LifeP04 38.4V 9ah removable v12.1 What are my options?

@Archie – We’ll be in touch with our current pricing options! https://ebikemarketplace.com/products/prodecotech-e-bike-battery-replacement

have 2 prodeco batteries need rebuilt 24 volt 9 ah high power lithium lifePo4 batteries need rebuilt have cases sit on rear carrier what approximate cost been looking for a while no luck thanks

@Stacey – Our current pricing can be found here: https://ebikemarketplace.com/products/prodecotech-e-bike-battery-replacement?variant=7418428194846

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