There are some in the BMW community that believe 90ah, 92ah and 95ah are so close to each other that you don't need to code the change from 92ah to 95ah.

Are you in that camp?

 

There are only a few choices and you can't use any number.

I surfed and found this table that someone said was in on of the BMW tools:

80ah - 80 ampere-hours​

90ah - 90 ampere-hours​

110ah - 110 ampere-hours​

70ah - 70 ampere-hours​

55ah - 55 ampere-hours​

46ah - 46 ampere-hours​

70ah_agm - 70 ampere-hours (agm)​

90ah_agm - 90 ampere-hours (agm)​

60ah_agm - 60 ampere-hours (agm)​

80ah_agm - 80 ampere-hours (agm)​

If the current one is 92Ah, then the new 95Ah battery is close enough to the current setting if it is already 90Ah. Make sure the battery chemisty is right.

 

Nice find.

The table tells a good story about actual BMW battery coding.

My current battery is 92ah and its an AGM. The new battery is 95ah and its an AGM.

Its interesting the table only shows a setting for 90ah_agm and nothing higher (e.g. 95ah)

So there is no coding to do (only registering).

Mystery solved. Thanks.

 

Here's another question.

How fast do you have to register a new battery?

Optimally, you would do it immediately. However...

If I install the new battery in the Costco parking lot (and give them the old battery), I'll have to drive home about 6 miles before I register it.

Will that hurt the new battery?

 

its not necessary to register the battery immediately, no damage will be done if its done within a month or so.

 

A battery need only be registered from best service life. Choose the nearest LOWER capacity to prevent overcharge.

one ampere-hour of overcharge electrolyzes 0.335 grams, 400 cubic centimeters of electrolyte water to oxygen and hydrogen gas that is vented and lost. An AGM battery is built with the minimum possible electrolyte to achieve specifications. As electrolyte volume is lost so is effective plate area and capacity lost. As electrolyte water is lost the acid becomes more concentrated increasing apparent battery voltage and terminating constant current charging phases early.

 

Did not know that you have to actually register/ program a new battery. Replaced mine about two years ago and seems to be working just fine.

 

take in to account that registering and recoding a battery are two different things. registering a battery is resetting the date mileage etc in the DME as the charging curve needed for the battery changes over its age. coding is for when changing the AH rating of the old vs the replacement battery. both only apply to AGM batteries.