BMW 61218381738 Battery, Manuf.: Douglas (Warranty Only)

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It is important to note that when the battery of a vehicle is disconnected, the radio code, on-board computer settings and clock settings are lost. It is therefore advisable to obtain the radio code in advance. After reconnecting it, you will not be able to get sound through the radio until you input the correct code. One should avoid tools bridging battery terminals because this may cause short circuits, sparks and even personal injuries. Due to explosive gases emitted by batteries for example no smoking, open flames or sparks within close proximity to a battery are allowed hence strictly discouraged. Properly securing it with hold-down devices can prevent cracking, acid leakage and accelerated discharge. It should also be regularly visually examined for cracks, leakages and corrosion on its case if any since this might lead to a bad one that has to be rectified immediately. Electrolyte levels in unsealed batteries need periodic checkups either by inspection through case or removing cell caps as well as topped up with distilled water in some cases. The battery cables and terminals must remain free from corrosion while the top of the battery must always be kept clean to prevent discharge. This helps maintain charge in vehicles which are not frequently operated and for those having additional accessories like radios; they may require negative battery cable disconnection during storage periods. In order not reduce its lifespan unnecessarily do not discharge recharge your battery without necessity doing so will shorten it's life considerably . Distilled water should refill each cell up to level indicated by split ring (each) or outside of case (a line). Battery terminals should be cleaned annually so that wires brush plus dielectric grease can be used instead of cleaning off rusts right away after disconnecting negative cable opening positive clamp first Will replacing damaged cables required testing their condition because damaged cables, Men of great importance in changing exposed cells include activities such as ventilation, evacuation before cleaning necessary supplies including protective clothing that includes goggles gloves apron For instance, the E30 series has its battery in the right side engine compartment, while the E36 series has it in the luggage compartment and Z3 models have it centrally placed. When replacing a battery, it is necessary to choose one having enough cold cranking amps equal or even greater than that of the original battery by considering the wire aging as well as increased electrical resistance of older vehicles. In this case, you should open your car trunk, unplug negative and positive cables from it, take away both batteries with their brackets along with radio recoding and reinitialization of windows if they are electrically operated and possess finger jams.

Systems such as the alarm system, power door locks, or control unit memory.

Check the external condition of the battery for any damage or loose connections.

Lift the catch and remove the right-hand side trunk side trim.

Unscrew the bolt and remove the battery retaining clamp.

For power window regulator motors, a specific initialization process needs to be followed. This includes closing and opening the window completely multiple times while holding the switch in the appropriate direction. Additionally, the one-touch control, anti-trapping, and comfort functions should be checked.

Press the sunroof operating switch into the tilt position and hold it there. Once the sunroof has reached the fully tilted position, hold the switch in that position for approximately 20 seconds. Initialization is complete when the sunroof briefly lifts at the rear again.

Several of the vehicle's electronic control modules will require time to relearn certain values, which will normally be complete within a normal driving pattern of 15 miles. Additionally, several systems may require re-initialization.

Green signifies adequate charge, black indicates inadequate charge requiring a recharge, and yellow denotes a defective battery that needs replacement.

Battery testing determines the battery's condition and state of charge.

Underneath the vehicle at the battery box are two power transfer points for the two cables that run to the engine compartment.

The test is conducted by applying a high resistive load to the battery terminals and simultaneously measuring battery voltage.

After removing the battery, you should clean away corrosion in and around the battery tray and on cable ends.

The electrolyte contains poisonous and corrosive sulfuric acid, so wear protective safety glasses and keep it away from your eyes, skin, and clothes.

Open the battery isolation switch and monitor the current draw.

A transformer-based battery charger is inadequate because it does not provide consistent, clean voltage and may not eliminate AC, which can be harmful to the battery and control modules.

Battery parasitic draw testing detects excessive current flow when the vehicle is off.

Corrosion on hold-down components and surrounding areas can be removed with a solution of water and baking soda, followed by rinsing with plain water. Any metal parts damaged by corrosion should be covered with a zinc-based primer and painted.

If the open-circuit voltage is okay but the battery still lacks power for starting, a load voltage test should be performed.

Loosen the clamp nut and disconnect the clamp from the battery negative terminal, making sure to position the negative cable away from the battery.

The battery is located under the cargo floor in E83 vehicles.

A battery load test can be performed using a load tester. The load tester should be connected to the battery terminals and the load should be maintained for 15 seconds, ensuring the battery voltage does not drop below 9.6 volts. The load tester will indicate if the battery is weak or defective.