If you don't know the AH rating, you can calculate it based off of the Reserve Capacity rating, which is generally easier to come by (should be stamped on top of the battery).Ĭalculating AH rating based off of the Reserve Capacity rating:Īmp/Hours = (Reserve Capacity / 2) plus 16 (i.e. Register the new battery with the ECU requires that you know the Amps/Hours (AH) rating of your new battery. The only two AGM batteries I have found to be form-fit-and-function compatible with the OE BMW battery for the ’08-’10 e70 is the Duralast H8-AGM and the Deka 9AGM49 (as a matter of fact, the Duralast is made by Deka for Autozone). An equivalent is defined as same battery type (wet cell vs AGM type) and same Amp Hour rating. Registering: doing this tells your ECU that you are replacing your OE battery with an equivalent. Make sure you understand the difference between “registering” and “coding”.
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