Battery or alternator or normal
#1
MBWorld Fanatic!
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Battery or alternator or normal
2013 Glk 350 70000 miles , Interstate AGM battery 18 months old. Drive 1 hr a day. Battery doesn’t seem to be kept 100% charged by Glk , I can put it on one of several chargers at any time and they say 80% charged and take up to 3 hrs to charge it. Voltage of battery might be 12.25, and Cca about 110 CCA lower ! than the charger will get it. I’m thinking the alternator just won’t keep it like it should be. Car starts fine , I’m just wondering if this is normal.
Charging it with a CTEK it gained 70 Cca I think that’s a lot .
i never use stop start, that’s the first thing I shut off every day
i just charged it CCA went up 110 a !
Charging it with a CTEK it gained 70 Cca I think that’s a lot .
i never use stop start, that’s the first thing I shut off every day
i just charged it CCA went up 110 a !
Last edited by Mmr1; 09-19-2022 at 10:48 AM.
#4
MBWorld Fanatic!
I have read, but have no confirmation, that charging systems have been designed this way for fuel economy reasons. Under normal operating conditions, the battery isn't charged more than 80% because there's no functional benefit to topping it off. I haven't checked this on my G550, but I was surprised to find that my '22 BMW X7's battery took a couple hours of 10A charging from my Noco charger after returning from a 250 drive.