What to Know About Ebike Batteries

Chris Crossed

Lithium ion ebike batteries are the most expensive part of any electric bike so keep them stored properly is key to their longevity. Most are rated for 700-800 charge cycles over their lifetime so they should last you a number of years.


For example, if you charge 2X per week that equates to 110 charges per year.

Larger e-bikes that can go longer distances, have faster speeds, and carry more weight require more power to charge them. So when shopping for ebikes try to buy one with the biggest possible battery in amp hours (ah).

Typically an e-bike battery will require 500-800 watt-hours for a full charge. Many e-bikes use lithium-ion batteries, which can charge incredibly fast. A fully depleted lithium-ion battery can take anywhere from 3.5 to 6 hours to recharge.

But if the bike uses lithium-ion batteries, you don’t always need to fully recharge to 100%. The battery charges to 90 percent capacity very quickly, and the last 10% takes much longer because it charges at a lower wattage. So, depending on the lithium battery size, your e-bike could be at 90% after just a few hours of charge.

How Often Should You Charge Your E-Bike?

In general you should always recharge your battery. While you could fully discharge your e-bike’s lithium battery without causing permanent damage, try not to let it remain below 30% capacity. Many e-bikes encourage users to rotate between charging at 30% and 75% to help increase an e-bike’s battery life and keep you safe on the road.

Your e-bike is should be ready to go when you are. You don’t want to be waiting around for your e-bike to charge, so having a plan for keeping it charged will set you up for success.

Will Leaving Your E-Bike Charging Overnight Damage the Battery?

Most electronics these days usually shut down charging once a battery is full. If your e-bike has a lithium-ion battery, you should verify that you can leave your charger plugged in overnight. I have done this many times without issue.

Overcharging any type of battery can damage it, so make sure yours will automatically stop charging at full if you’re going to leave it plugged in overnight. Chargers that come with ebikes generally have BMS (battery management systems) that take care of this.

The Bigger the Motor the Bigger the Drain

Finally remember this rule, the bigger the motor is on your ebike the more power it will drain from your battery. A 500 watt motor will always demand less from a battery than a 750W or 1000W motor. When choosing Ebikes with larger motors, look for dual battery options or ones that come with single batteries with at least 19-20ah of battery.

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Ebike enthusiast and blogger.

Norwalk, CT

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