Replaced OEM battery with NAPA Legend International BCI 49 model 7549, cold cranking amps 900, 185 minute reserve capacity. my problem is battery doesn't say what AH ampere hours it is.

When I go to retrofit it in Progman (a pre-requisite to battery registration in DIS, if replacing with a different capacity battery), it asks if it's a 80ah or a 90ah. Called NAPA, they won't know until Monday.

I would guess if the OEM is a 90ah, I think I read somewhere it is, then the NAPA having more cold cranking amps than the OEM, and longer reserve capacity, I would guess it's also a 90ah


After much reading on battery registration and having gone through Progman and DIS menu's, I can tell that battery registration is not b.s.. I guess if you wanna save money in the short term, you can drive on an unregistered battery, but it'll live so much longer if properly coded and registered, so it'll save you money in the long term.

 

Some cars are equipped with 110Ah batteries. My '06 530 has 110Ah battery. I replaced it about 2 years ago.

Our cars are equipped with IBS (not-so-intelligent battery sensor).
If it's an intelligent battery sensor, it'd sense the change in battery amps and change the charging characteristics automatically. I wonder what is the purpose of the IBS is other than fail once in a while and requiring the owners to replace IBS.

 

Amp/Hours = (Reserve Capacity / 2) plus 16

 

Update, NAPA told me it's 100 AH. I've never heard of a 100AH, I've heard of 80, 90 and 110. That being said, Progman/SS only give me the 80 or 90 AH option.

Mostroad, using your formula, I get 185 minutes / 2+16 = 108.5...which doesn't match what NAPA told me, but it's close.

When coding the new battery, I guess I'll choose the 90 AH option. My next battery will be a 90.

Don't know about this car being that "intelligent" if you have to go through coding and retrofitting and registering. An intelligent car would pick all of that itself.

 

True ... but take 'registering' as 'cuz the battery so dumb stupid since not intelligent enough to let the car know so the car would then pick all of that itself ... ...