There are two main problems:
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1. Battery damage, overdischarge, if the battery can still be used normally then this problem is eliminated.
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2. Eliminate battery damage, of course, the charger is the problem, if it will check the circuit better, if not, replace as early as possible. Strong flashlight, also known as LED flashlight, is a new lighting tool with light-emitting diode as a light source, which has the advantages of power saving, durability, strong brightness and so on.