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      08-27-2017, 03:50 PM   #26
Bimmer-Bob
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Drives: 2010 128i
Join Date: Feb 2010
Location: Anacortes, WA

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If anyone is still shopping for batteries, Pep Boys (online) has a promotion for 25% off. I picked up a Bosch S6 AGM battery for $164.99 (+$15 core charge, which you will obviously get back if you return your old battery to a local store). I don't have a Pep Boys close to me, so I ate the cost, and ended up spending $179.99. Still not bad for the top-of-the line AGM battery from Bosch, IMO.

As mentioned, the battery needs coding AND registration (these are two separate things). The coding is to tell the car the type of battery (flooded or AGM) and the amperage. Registering the battery simply tells the car that the battery is new, so that the Intelligent Battery Sensor can correctly charge the battery, monitor temperature, etc. Parameters change with the age of the battery.
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