How many hours does it usually take to fully charge a rechargeable flashlight?

Charge for 12 hours at first, and the first three times need to be fully charged. Rechargeable flashlights are generally lead-acid batteries, which can be fully charged in four or five hours. If it is a lithium battery, it is recommended to fully charge it. Do not charge the flashlight when it is completely out of power, so as not to shorten the life of the flashlight.
The power level has a lot to do with the storage time. It can be used when you buy it. When the brightness of the LED bulb becomes dim, it should be charged in time. Lithium batteries should not be overcharged or over-discharged. Some control circuits are better designed and have perfect protection measures, so the maintenance requirements for the battery will be much lower.