The rechargeable battery can be removed and used after about 2 hours of charging; the light of the charging cable will go out once it is fully charged, and if the voltage is unstable, the indicator light may not be accurate (the light will flicker on and off if the current is unstable). It takes about 50 minutes to use it after a full charge. (The rechargeable version cannot be fitted with a regular No. 5 battery.) The ordinary battery of the remote control depends on the frequency of use of each individual.