Recently, a car friend asked BMW about battery, saying "BMW battery can be charged with charger". It's estimated that the friend bought BMW soon, but also liked the car. He thought that occasionally he would extend the battery life, but he was afraid of using the wrong things, so this problem.
BMW is equipped with automatic start stop function, so it is also equipped with automatic start stop AGM battery. The charging voltage of this kind of battery is generally 14.5V, while that of the general charger is 15.5v, so you can only choose intelligent charger or AGM special charger, otherwise you may not be able to charge.
1、 Knowledge of prolonging battery life
1. The normal starting time of the vehicle shall not exceed 3-5 seconds. If the car does not start for 5 seconds, stop starting immediately and wait for 10 seconds to restart.
2. When the engine is not running, try not to use automobile electrical appliances (sound, light, etc.).
3. Before getting off the bus, first turn off the electrical equipment, and finally turn off the engine.
4. If the vehicle is not used for a long time (such as more than 2 weeks), it is recommended to disconnect the negative pole connection to reduce the battery loss. Of course, for BMW, you can't disconnect, or you'll lose data. Therefore, if conditions permit, it is recommended to find a relative slip circle every two weeks.
5. It is recommended to use the floating charging mode of charger to charge the battery every six months. Do not remove the battery, open the engine compartment, connect the positive terminal of the charger to the positive terminal, and connect the negative terminal to the negative terminal or the body.
If we can do the above, you use BMW original car battery, which can be used for more than 7 or 8 years.
2、 Replace the battery precursor
1. It's difficult to start the vehicle. More than one spark is needed. I feel that the starting power is insufficient.
2. When the engine is not running, press the horn several times. If the sound is obviously weak, it means that the power is not enough and it needs to be replaced.
3. If the engine does not run, turn on the front lamp for 5 minutes. If the front lamp turns from bright to dark, the power is insufficient and needs to be replaced.
4. After frequent parking for one night, the meter will display an icon or prompt to charge the battery.
If the car appears for 1 or a certain period of time, and then combined with its own car battery life, such as BMW original car battery has been used for more than 4 years, then it is necessary to doubt whether the battery needs to be replaced.