Charging your eBike battery correctly is an important part of using it safely and keeping it in good condition. Whether you use a 24V, 36V, 48V, 52V, 60V, or 72V lithium battery, you should use the right charger and follow the correct connection and disconnection steps.
In this guide, we'll show you how to prepare your battery and charger, connect everything in the right order, check the charging indicator, and disconnect the charger when charging is complete.
Watch Our eBike Battery Charging Guide
Watch the video below to see the charging process. The battery and charger shown are examples. The same basic charging principles apply to BOOANT battery packs, but you must use a charger that matches your particular battery.
Before You Start Charging
Before connecting your battery, take a moment to check the battery, charger, and charging area.
- Use a charger with the correct output voltage and charging specifications for your battery.
- Check the charger, cables, connectors, and battery charging port for visible damage.
- Make sure the battery and connectors are dry.
- Choose a clean, dry, well-ventilated location away from flammable materials and excessive heat.
- Keep the charger uncovered so heat can escape.
- Read the instructions supplied with your particular battery and charger.
Important: Do not use a charger simply because its plug fits the battery. The output voltage, battery chemistry, connector polarity, and charging specifications must be compatible with your battery.
How to Charge Your eBike Battery Step by Step
1 Prepare the Battery and Charger
Place the battery and charger on a stable, dry surface with enough space around them for ventilation. Check the cables and connectors before use.
If the battery is damaged, swollen, leaking, unusually hot, or has a damaged charging port, do not charge it.
2 Connect the Charger to AC Power
First, plug the charger's AC power cord into the charger, then plug the other end into a suitable wall outlet. Check that the outlet voltage matches the charger's input requirements. Do not use a damaged power cord, a loose outlet, or an unsuitable extension cord.
3 Connect the Charger to the Battery
After connecting AC power, connect the charger's output plug to the correct charging port on the battery. Make sure the connectors are aligned correctly and fully connected. Never force a plug into a port.
4 Check the Charging Indicator
Once the charger is connected, check the indicator light to see whether charging has started.
On the example charger shown in the diagrams, the indicator meanings are:
Indicator lights vary between charger models. Always check the labels and manual for your own charger rather than assuming that every charger uses the same colors. If the charger has a fault, the indicator may also show red.
Stay nearby while charging and check the battery and charger periodically. If you notice unusual heat, swelling, smoke, a burning smell, or other abnormal behavior, stop charging if it is safe to do so. If the battery is smoking or overheating, keep away from it.
5 Disconnect the Charger From the Battery
When the charger indicates that the battery is fully charged, disconnect the charger output plug from the battery first. Hold the connector rather than pulling on the wire.
6 Disconnect AC Power
After disconnecting the battery, unplug the charger from AC power. Grip the plug when unplugging it. Do not pull on the cable itself. Keep the charging port clean and dry, and store the charger in a dry place when it is not in use.
Important eBike Battery Charging Safety Tips
1. Always Use a Compatible Charger
Different lithium-ion battery packs require different charging voltages. For example, a typical 48V lithium-ion battery uses a 54.6V charger, while a typical 52V lithium-ion battery uses a 58.8V charger. A typical 72V lithium-ion battery uses an 84V charger.
These are examples of common lithium-ion configurations, not universal specifications for every battery. Always confirm the required charger voltage and charging current for your specific battery.
2. Charge in a Dry, Well-Ventilated Area
Keep the battery and charger away from water, rain, direct sunlight, excessive heat, and flammable materials. Never cover the charger while it is operating, and do not charge a wet or damaged battery. Keep the charger vent clear and away from other objects.
3. Do Not Leave Charging Batteries Unattended
Check the battery and charger periodically while charging. Disconnect the equipment when charging is complete, following the manufacturer's instructions. Avoid charging overnight or leaving the battery charging while you are away.
4. Do Not Ignore Unusual Signs
Stop using the battery and charger if you notice damaged wiring, a burning smell, unusual heating, swelling, or other abnormal behavior. If the battery produces smoke or catches fire, do not handle it; move away and contact emergency services.
5. Store the Battery Properly
After charging, store the battery in a cool, dry place away from direct sunlight and heat sources. Around 40 to 60 percent is a better storage level. Check it every 60 to 90 days and top it up if it has dropped too low. If you will not use it for an extended period, follow the battery manufacturer's recommended storage charge level and inspection schedule.
Frequently Asked Questions
How do I know when my eBike battery is fully charged?
Check the charger's indicator light and its manual. On the example charger shown in the diagrams, red means charging and green means fully charged. Other charger models may use different indicators.
Can I use the same charger for every eBike battery?
No. The charger must match the battery's required output voltage, charging current, chemistry, and connector specifications. A charger designed for one battery voltage should not be used with another battery unless the manufacturer confirms compatibility.
Should I unplug the charger from the wall or the battery first?
Disconnect the battery first, then unplug AC power, as shown in the video. Connect in the reverse order: plug into AC power first, then connect the battery.
Is it safe to charge an eBike battery overnight?
It is better not to leave a lithium-ion battery charging unattended overnight. Charge it in a suitable location, check it periodically, and disconnect it when charging is complete according to the manufacturer's instructions.
Do I need to wait until the battery is completely empty before charging it?
No. For most lithium-ion eBike batteries, you do not need to wait until the battery is fully discharged before recharging it. Follow the recommendations supplied with your battery.
Can I use the 84V 5A charger shown in the video with a 48V battery?
No. The example 84V charger is intended for a compatible battery that requires that charging voltage. A typical 48V lithium-ion battery requires a 54.6V charger. Always check your battery's specifications before connecting a charger.
Final Thoughts
Charging your eBike battery correctly is a simple habit that helps you use your battery safely and take better care of it.
Use the correct charger, follow the recommended connection sequence, check the charging indicator, and disconnect the equipment properly when charging is complete.
The battery and charger in our video are examples. The same basic principles apply across BOOANT's 24V, 36V, 48V, 52V, 60V, and 72V battery range, but each battery must be paired with a compatible charger.
If you have questions about the correct charger for your BOOANT battery, check your product specifications or contact our team before charging.
BOOANT: Battery Power for Your Ride.
