1 and uv365 purple light identification lamp circuits are broken: internal wiring is broken, and the brass spring conductive sheet inside the plug is deformed. Find out whether the broken part is connected or whether the spring piece is deformed and shaped.

2. The electronic components of the charging circuit are damaged: check the step-down capacitor and rectifier diode. Replace the damaged parts.

3, rechargeable battery failure: First, lead-acid batteries, battery plates are easy to age. Cleaning the electrode plate and replacing it with distilled water (or purified water) is even worse. )。 Part of it can be repaired. The other is a nickel-hydrogen battery, or a nickel-cadmium battery. This kind of battery may not have expired, but it can't be charged due to memory effect, which is mostly caused by insufficient charge and discharge during use. At this time, the battery can be discharged, and it needs to be recharged with a discharge current limiting resistor, and some of it can be repaired.