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lip277 · 02-21-2022, 05:04 PM

I would do a battery in a BMW, Mercedes or Audi at 4 years. I just did batteries in my E38 and 997. Both are/were on BatteryMinders when not being daily driven, but the batteries these days are NOT what they used to be. The lead has to be 100% recycled now - no new automotive batteries sold new in US or Canada that are not that way.

One thing my mechanic recommends is to use AGM for 'regular' cars now. He has seen many 1 or 2 year old regular style batteries pack it in while the AGM's seem to do a bit better. I got 15 years out of the AGM in my Mustang (before it died) and were working with 7 or 8 years out of the other cars till I noticed them getting weak. The batteries in the PSD were 8 years old and starting to get weak as well. So - I bought new batteries the end of last year. 5 or 6 batteries... LOL. All AGM by the way...

YMMV of course

02-21-2022, 05:04 PM	#8
lip277 The old cranky SOB.... Join Date: Oct 2003 Carmudgeonly Ride: several cars... way too many.... Location: Near Seattle Posts: 4,798	I would do a battery in a BMW, Mercedes or Audi at 4 years. I just did batteries in my E38 and 997. Both are/were on BatteryMinders when not being daily driven, but the batteries these days are NOT what they used to be. The lead has to be 100% recycled now - no new automotive batteries sold new in US or Canada that are not that way. One thing my mechanic recommends is to use AGM for 'regular' cars now. He has seen many 1 or 2 year old regular style batteries pack it in while the AGM's seem to do a bit better. I got 15 years out of the AGM in my Mustang (before it died) and were working with 7 or 8 years out of the other cars till I noticed them getting weak. The batteries in the PSD were 8 years old and starting to get weak as well. So - I bought new batteries the end of last year. 5 or 6 batteries... LOL. All AGM by the way... YMMV of course __________________ *Kevin* 1970 2800CS - - 2001 740iL - - 2006 997.1 - - 2012 Escalade 1968 Mustang GT Convertible - - 2003 Ford F250 PSD - - 1985 728i