Car Battery Replacement at your home

• Your car doesn’t start. A new battery has a definite capacity to provide power. This capacity is referred to as the cranking amps rating of the battery. The actual amps that a battery can supply become lower than its original rating as a battery age. Once the cranking amps fall below a critical threshold, it will be hard or impossible to start your car.
• The battery or charging system warning light is illuminated. A mechanic must perform a few basic tests to pinpoint if a battery replacement is necessary when a battery or charging system warning light illuminates.
• Electrical components don’t work. Vehicle electrical components such as the security system can malfunction once a battery has started to fail, and the voltage produced by the battery drops. If you are experiencing electrical malfunctions, it’s a smart idea to have the battery tested.

• A temporary power source might be installed to avoid the possibility of losing radio presets or stored data in the PCM while the battery is out. When the battery is already completely unusable, this step is not needed.
• The vehicle’s negative cable is detached from the battery, followed by the positive cable. The battery tie-down system is loosened and the old battery will be taken out.
• Cable ends and wiring is carefully examined to ensure no corrosion and cleanliness. Corrosion can be extreme and cable replacement or wiring repair is necessary in some cases.
• The new battery is installed and the tie-down system is reinstalled. Anti-corrosion compound is applied to the battery terminals. The positive terminal is reconnected followed by the negative terminal.
• Some vehicles, like some models of BMW, VW, and Audi, may need PCM programming to input battery parameters. This step, achieved using a specialized scan tool, is essential to maximize battery life and avoid electrical system malfunctions.
• The car is started and charging system output is measured and compared against the factory OEM specification to guarantee that the new battery will properly recharge. In general, charging output will be in the range of 13.8 to 14.8 volts but the exact specifications depend by the built and model.

Yes, however, if you have a weak battery you might be left stranded somewhere if the battery dies completely and you cannot start your car. A faulty battery may also unnecessarily overload the alternator and could badly affect the operation of the vehicle’s electrical system, including the vehicle security system and the shift interlock.