L322 Battery Drain

Papatoad said:

do you live in a cold climate? im hoping with getting a new battery along with putting it on a trickle charge every other day or two will keep it longer. Surviving a couple of weeks is something id die for

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As many have said, the new battery needs to be 950CCA or more and 120AH

Do you need to code the increased battery size on a 2004? Not sure if it has BMS at that age, if it does though that could go some way to explaining why the batteries aren't lasting couldn't it? I expect the car is too old but perhaps someone with knowledge on the earlier ones could weigh-in on that front.

AB in my handle is Alberta, land of the block heater. L322 battery is H9, which WalMart doesn't sell. The H8 AGM is 900CCA ($179 I think). If I had a choice at or near the same price, with a 4 year replacement warranty, I'd have H9. I found H9's were nearly twice the price, pro-rated warranty. AGM delivers high voltage over longer than conventional wet cell batteries and charges faster. I'd expect reliable starting to 0*F. on the BMW 4.4 from my 2002 MB E320 experience. My 2007 MB GL450 $2000. mini dollar+$500. variable cam junker? It has no block heater, fires on first cylinder at -40* on an H6 . Such is progress.