① The battery cannot be charged

The inability to charge during charging can be attributed to the following reasons: reverse connection of the charger or charger failure; Protection board protection not restored or protection board failure; The battery pack is disconnected from the outside of the electrical appliance.

When dealing with the above adverse phenomena, check in sequence: whether the charger is connected in reverse, whether the positive and negative plugs of the battery pack are connected in reverse; Restart the electrical appliance to remove the protection board and measure whether the MOS transistor on the protection board has a driving voltage; Check if the wiring connections are loose or disconnected.

② Short range

The battery pack drains quickly when in use, and the reasons for this situation include: the lithium-ion battery is not fully charged; There is a large difference in voltage capacity between single strings; The micro short circuit or self discharge of the battery pack can cause the battery pack to be fully charged before being consumed.

To address the above issues, the battery pack can be recharged or defective cells can be replaced.

③ Softening fault of battery panel

The important manifestation is that the surface of the positive electrode plate gradually softens from a solid to a paste like state, and as the surface area decreases, it leads to a decrease in battery capacity.

Repair method: After discharging 10.5V, discharge the bulb for 1-5 hours. Next is the activator, which activates and repairs. In this way, it is possible to repair, but in heavier cases, only a new one can be replaced.