- «positive» And «negative» battery wires can be easily mixed up. In case of doubt, check the polarity of the circuit to the battery or provide for wire marking;
- should be disconnected first «negative» («mass») battery wire;
- If your car's radio has an anti-theft code, make sure you have the code at hand before disconnecting the battery. When the battery is disconnected, this code, which is important for the operation of the radio, is erased, so the next time you connect it, you will need to enter it again. All previously programmed radio stations are also erased, so they must be programmed again;
- some alarms are triggered when the battery is disconnected. For this reason, you should first figure out how to turn them off before disconnecting the battery.