We can’t use a 12V charger to charge a 24V battery.

1. can not use 12V charger to 24V battery charging reason

The current generally flows from the side with the larger voltage to the side with the smaller voltage, too low voltage is difficult to make the current flow properly and cannot charge the battery properly. The charging process usually only occurs when the charging voltage is greater than the battery voltage. When charging a 24V battery with a 12V charger, the voltage can’t meet the demand of the battery and may make the charging process ineffective, so you can’t use a 12V charger to charge a 24V battery.

2. Disadvantages of using 12V charger to charge 24V battery

The rated voltage of the battery is 24V, the charger voltage is less than the battery voltage, the battery may not be charging but discharging, long time discharging is likely to have the risk of over-discharging, affecting the performance of the battery as well as shortening the life of the battery. In addition, it is difficult to provide enough voltage for the battery with a current of 12V, even if it can be charged, the battery may not be fully charged or the charging speed is very slow, and the charger will be too hot due to the excessive voltage, which will cause harm to the battery and the charger at the same time.

3. Solution

When you don’t have a 24V charger, you can use a boost converter or a boost coil, which can help you to increase the voltage, reduce the risk of damage to the battery, and charge your battery more safely, but this will increase the complexity and cost of the operation, and also more time-wasting, so it is not recommended to do so.

The best thing to do is still to buy a 24v charger, this will ensure a safe and effective charging process, but it will also improve the performance of your battery, reduce the risk of danger and also extend the life of your battery, so that you can also protect your battery and charger better.