How to use the rechargeable air pump
Can it be used when charging?
It cannot be used when charging, because the charging voltage is higher than the battery voltage, which will damage the lamp.
Is it necessary to charge when the battery is completely used up?
It depends on what kind of rechargeable battery is used in the lamp. The battery must be charged as needed and cannot be under or overcharged. Nickel-cadmium and nickel-metal hydride batteries must be used up and recharged, otherwise it will leave a memory effect. There are no special requirements for lithium batteries, but it is best to recharge them after they are used up, otherwise it will affect their lifespan.