Car battery replacement for BMW 3 Series (E46)

Car battery is a major player inside vehicle's electrical system. In sum, it accumulates electrical energy, which is a driving force for electric-powered mechanisms inside the vehicle. Thus, it's relevant to have the battery in a perfectly working condition. Notwithstanding, car battery is an expiring unit, which will run out in time irreversibly. More specifically, chemical processes inside the battery will become inefficient for production of electricity. Battery's lifetime has a limit of roughly 3 - 5 years, which means, it will lose the ability of being charged. When this happens, new battery installation should be considered.

There might be, that battery's energy will be wasted, due to soiled connection points. After some time, the terminals of a battery can get affected by corrosion, resulting in weak connection contacts. This is the reason why the battery can no longer be re-charged by alternator. Little by little, it will run out of energy and no longer provide electricity. Soil removal from cable and battery connection points, might recover the battery to its original state and turn it into suitable for further usage.

There is a possibility, the battery will get drained, if the car was left unused for a few weeks or so. In such case, battery recharge will possibly recover its efficiency. To start a recharge, you will need a battery charger.

BMW 3 Series battery location: luggage compartment (trunk) under right trim.