What are the possible reasons for zero or low voltage in the battery?

1. The battery is subjected to external short circuits or overcharging, reverse charging (forced overdischarging)

2. The battery is continuously overcharged by high rate and high current, causing the battery core to expand and the positive electrode to directly contact and short-circuit.

3. Internal short circuit or micro short circuit of the battery, such as burrs penetrating through the separator paper and causing short circuit, improper placement of the positive and negative electrode pieces, resulting in short circuit between the electrode pieces, or short circuit between the positive electrode piece and the steel shell, negative electrode dropping into the separator paper, defects in the separator paper itself, and short circuit between the positive electrode tab and the negative electrode piece.

What are the possible reasons for zero or low voltage in battery packs?

1. Is there zero voltage for a single battery

2. Short circuit, open circuit, and poor connection with the plug

3. Lead wire and battery detachment, virtual welding

4. Internal connection errors in the battery, such as solder leakage, virtual soldering, and detachment between the connecting piece and the battery

5. Incorrect connection and damage of electronic components inside the battery

What are the possible reasons why the battery pack cannot charge?

1. Zero voltage battery or zero voltage battery in the battery pack

2. Battery pack connection error, internal electronic components, protection circuit malfunction

3. Charging equipment malfunction, no output current;

4. External factors leading to low charging efficiency (such as extremely low or high temperatures)