![]() You must specify to the DME what the “ah” rating of your battery is so the car can run the proper charging algorithm. Moving between these two types without coding can lead to over-charging or under-charging.Īlso, batteries have a discharge rating called amp hours (ah). However, if you switch from a wet-cell type battery to an AGM type battery, or vice versa, you must code for the change.ĪGM and wet-cell batteries require a different rate of charge output from the alternator. You may not have to! That is, so long as you replace your old battery with an exact replacement. Reason why you need “code” for a new battery: Tutorial + FAQs: BMW 328i new battery reprogramming/coding
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