As our customer support receives many questions about e-bike batteries, we’ve decided to share some essential tips on how to properly care for your e-bike battery. We’ve written similar articles before, such as “Testing Your Battery,” “A Beginner’s Guide,” and “How to Speed Up Your Electric Bike.”

How to Charge an E-Bike Battery

When you're looking to buy a new electric bike, it's natural to wonder how to charge the battery. First, remove the battery from your e-bike and make sure the switch is turned off. Then, attach the charger and plug it in.

According to best practices, lithium-ion batteries—commonly used in e-bikes—can be safely charged at any time without harm. Charging happens in two stages: the first where 80–90% of the charge is added quickly, and the second where the final 10–20% takes longer. So even if you unplug early, your battery will still be mostly charged.

Many users also ask if they can replace their battery. The answer is yes—you can replace the battery at any time without affecting the bike’s performance or power output.

How Long Does It Take to Charge an E-Bike?

Most e-bike chargers have a red LED that turns green when the battery is fully charged. The charging time depends on the battery size, but it usually takes between 2 to 6 hours to reach 100%. For example, if your e-bike has a 40-mile range and charges in 2 hours, that means you get about 20 miles per hour of charging.

Can You Charge While Pedaling?

Some e-bikes allow you to recharge the battery while riding, adding up to 5–10% of the range. However, this feature may increase the bike’s cost and could make pedaling slightly harder. If you’re unsure about your battery life, it’s best to avoid relying on this feature during long rides.

Top Tips for Charging Your E-Bike Battery at Home

Here are the most important things to know when caring for your e-bike battery:

1. Charge regularly, even if you're not using the bike often. Lithium-ion batteries perform best with consistent use. If you need to store your e-bike for a while, clean it, charge the battery, and keep it in a cool, dry place.
2. Avoid extreme temperatures. Don’t charge your battery when it's very cold or hot, as this can damage the internal components. Ideal conditions are moderate, around room temperature.
3. Don’t overcharge. Leaving your battery plugged in for too long can reduce its lifespan. Use a timer or set a reminder to take it off the charger once it’s full.
4. Charge a new battery for 12 hours upon first use. This helps activate all the cells and ensures optimal performance right from the start.
5. Never store a completely discharged battery. Keep it at 40–70% charge if you’re not using it for an extended period.

Remember, proper storage and maintenance directly impact your battery’s longevity. Most standard e-bike batteries come with a 3-year warranty, covering at least 70% capacity. At Delfast, we offer a 2-year battery warranty and a lifetime frame warranty. We also provide flexible payment options to make buying your e-bike easier and more enjoyable. Contact us today for more information!