How To Choose Electric Bike Batteries

Batteries are the lifeblood of your electric bike, but with so many options to choose from, how do you know which one is right for you? Fortunately, there are probably several different battery types that would work well for your situation, so it would be hard to go completely wrong. However, the more you know about the different battery types available, the easier it will be to find the type that will most suit your preferences and needs. Once you have chosen the best electric bike for your needs, use this guide to help you find the ideal electric bike battery.

Lithium Ion Versus Lead-Acid

Most electric bikes use lithium ion batteries, but some use lead-acid. You can replace a lithium ion battery with lead, but there are pros and cons to doing so. Lead is less expensive than lithium ion up front, but it is heavier and will slow you down on the road. Consider also that you’ll need a 30 lb. lead acid battery to get you as far as a 6 lb. lithium battery of equal voltage will take you. Many people choose lithium ion because it makes up for its initial cost by providing superior power without weighing your bike down.

Understanding Volts, Amp-Hours and Watt-Hours

Three numbers tell you almost everything about an e-bike battery. Volts (V) measure the battery’s electrical pressure. Most e-bikes, including ours, run on 48V systems. Amp-hours (Ah) measure how much charge the battery holds. Watt-hours (Wh) measure the total energy stored, and they’re the best number for comparing batteries. To find watt-hours, multiply volts by amp-hours. A 48V 10.4Ah battery holds about 500 Wh, and a 48V 15Ah battery holds about 720 Wh. The bigger the watt-hours, the farther you can ride.

Size, Shape and Weight Considerations

When choosing an e bike battery, you’ll want to take size, shape and weight into consideration. A battery needs to fit your bike properly without weighing it down too much. You don’t need a giant, heavy battery to power your bike if you rarely go further than 20 miles on a single charge. A small, 6 lb. lithium ion battery can get you approximately 20 miles before needing to be recharged. Even if it doesn’t get you quite as far as you want to go, you can save battery power by spending more time pedaling. If you plan to travel long distances, a heavier, larger battery may be a wiser choice for your electric hybrid bike.

If you still have questions about what bike batteries you should purchase, talk to friends and family members who already own electric bikes and ask them what type of batteries they prefer. You can also join ebike cycling forums and learn all about preferred battery types.

How to Estimate Your Range

A simple rule of thumb is about 1 mile for every 20 watt-hours. Divide your battery’s watt-hours by 20 for a rough range: a 500 Wh battery gives about 25 miles, and a 720 Wh battery about 36 miles. Your real range will be higher with pedal assist on flat roads, and lower with heavy throttle use, hills, wind, heavier loads or cold weather.

What Size Battery Do You Need?

If you usually ride under 15 miles at a time on flat ground, a battery around 500 Wh is plenty. If you ride longer, climb hills, carry a passenger or weigh more, look for 700 Wh or more. For a deeper look, read our guide to e-bike battery sizes.

Battery Sizes on sixthreezero E-Bikes and E-Trikes

The EVRYjourney 500W uses a 48V 10.4Ah battery, good for everyday neighborhood rides. The Simple Glide Fat Tire 750W Recumbent steps up to a 48V 15Ah battery. The EVRYjourney Rickshaw 750W carries a 1,008 Wh battery with Samsung cells for passenger rides. For the longest trips, our dual-battery models, like the Simple Glide Dual 750W with 30Ah in total, double the energy on board.

Removable or Integrated?

A removable battery slides or clicks off the frame, so you can charge it indoors and keep it warm in winter. An integrated battery hides inside the frame for a cleaner look, but replacing it usually means finding an exact match. If you’ll charge away from where you park, choose removable.

Buying a Replacement Battery

A replacement must match your e-bike’s voltage, connector and mounting. A higher-voltage battery can damage your motor and controller, and a battery with the wrong connector won’t work at all. The safest choice is a battery made for your exact model.

How Long Do E-Bike Batteries Last?

A quality lithium-ion battery typically lasts 3–5 years, or about 500–1,000 full charge cycles, before its capacity drops to around 80%. Range shrinks slowly over that time, rather than all at once.

Choose a Certified Battery

Most e-bike battery fires involve cheap aftermarket batteries with poor design or construction. Look for batteries tested to the UL 2271 safety standard. The battery on our EVRYjourney 500W, for example, is compliant to UL 2271 as tested by ACT Labs.

Charging Tips to Make Your Battery Last

For everyday riding, charge to about 80–90% instead of 100%, and recharge when the battery drops to 20–30% instead of running it to empty. Charge indoors on a hard, dry surface, and use the charger that came with your e-bike. For cold-weather and winter storage tips, read our guide to riding your electric bike in the winter.

FAQs:

How do I calculate e-bike battery watt-hours?

Multiply volts by amp-hours. A 48V 15Ah battery holds 720 Wh.

How far can I ride on a 500 Wh battery?

About 25 miles as a rough estimate, more with pedal assist on flat ground and less with hills or heavy throttle use.

How long does an e-bike battery last?

Typically 3–5 years, or 500–1,000 full charge cycles.

Should I charge my e-bike battery to 100%?

For daily rides, 80–90% is gentler on the battery. Charge to 100% before a long ride.

Can I put a bigger battery on my e-bike?

Only if it matches your bike’s voltage and connector. A battery made for your model is the safest option.