These protection measures usually include:

1. Overcharge protection: When the battery is fully charged, the charger will automatically stop charging to prevent damage caused by overcharging of the battery.

2. Overdischarge protection: If the battery power is too low, the charger will automatically stop discharging to prevent overdischarge of the battery from affecting its life.

3. Overcurrent protection: When the charging current is too large, the charger will automatically cut off the power supply to prevent short circuit or overheating of the circuit.

4. Overtemperature protection: When the temperature of the charger or battery is too high, the charger will automatically stop working to prevent safety accidents caused by high temperature.

5. Short circuit protection: If a short circuit occurs during charging, the charger will quickly cut off the power supply to protect the circuit and battery.

6. Insulation protection: The outer shell of the charger usually has good insulation properties to prevent electric shock accidents.

These safety protection measures can effectively prevent the following problems:

• Battery damage: Overcharging, overdischarging, overcurrent, etc. will damage the battery and shorten the battery life.

• Safety accidents: Overheating, short circuit, etc. may cause fire or explosion, resulting in casualties.

• Equipment damage: The charger and battery itself may also be damaged due to overload or short circuit.

To ensure charging safety, you also need to pay attention to the following points:

1. Choose a charger produced by a regular manufacturer: The quality of chargers produced by regular manufacturers is more guaranteed and the safety performance is higher.

2. Follow the instructions: Read the instructions of the charger carefully and operate according to the requirements in the instructions.

3. Check the charger regularly: Check the charger regularly for damage or aging, and replace damaged parts in time.

4.  Keep ventilation: When charging, keep the charging environment well ventilated and avoid high temperature.

Tips: Lithium batteries have a high energy density, so you must pay attention to safety during use. If you find any abnormality in the charger or battery, stop using it immediately and contact a professional for repair.