My EVIC said the operating voltage was 13.7v, but I decided to put it on the charger anyway Wednesday night. I got a full 14.4v by morning. Yesterday, the Snowhawk almost stranded me again. After a few words of encouragement it fired up and I was on my way to ski country. The snow level is down to 7000 ft :smile: after the last storm.
This morning it is at 14.4v, resting is at 12.1v. I can't decide if I have a battery problem or an electrical problem. Thoughts? If I don't buy a replacement battery this weekend (recommendations?), I'll have it checked at my next free oil change and rotation.
I guess I'll be doing more research in the off hours. :frown:
OEM TH battery
Ok, a lot of things to address there :
1) Forget my post about Northstars up here in Canada. That was not relevant, especially about the group 27 Northstars which are crazy expensive and are not OEM fit (it is actually the 27F that will fit a Cherokee, not the 27M (marine) ; I pointed to that one becauswe it is the only (relabelled) group 27 Northstar sold by our Canadian Tire chain stores, was using it as a price example only). You guys can find a premium group 94R Northstar AGM (or the X2 Power clone at Batteries+) for under $300. Now there are very similar premium group 94R Odysseys (pure lead thin plate AGMs) at Autozone for $250.
2) 14.4V or 13.7V running can both be Ok, depending on many factors. *Running* means this is alternator output, not battery voltage per se. We can't determine battery health or state of charge when the engine is running, basically. If you had gotten running voltage in the 12V range or lower, then yeah charging system problem for sure. Not the case here.
12.1V resting voltage, however... is low. If you had zero drain on the battery when you checked it (no key in ignition, no lights etc..) then I'd say your battery is dying for sure.
Problem with these batteries, in a Cherokee, is that when they start to go, they don't neessarily die in a predictable way. I've heard members say they put theirs on a charger overnight with no benefit. That's likely because the BCM monitors battery health, meaning how it handles drains and charges, so even a freshly charged unhealthy battery would not *pass* system checks, and cause problems.
Suggesstions for a battery :
1) If you'd prefer spending under $200 for an OEM clone AGM (Johnson Controls flat plate AGM), then the lowest price I've seen lately is Autozone's Duralast Platinum group 94R ; they had a coupon thing going, not sure it is still in effect.
Ok I see Walmart is still showing some H7 AGMs in stock, for $165 :
(that is the exact same Johnson Controls group 94R AGM sold everywhere. H7 = group 94R)
You may find other stores that carry teh group 94R (or H7) AGMs, like Pep Boys, Advanvced Auto Parts, Sam's Club, etc...
2) The Northstar 94R. Hard to find right now, but the X2 Power (it's a Northstar) is available at Batteries+ for $279 (after a $20 mail-in rebate):
3) The premium Odyssey 94R (pure lead flat plate) at Autozone. Oh ! It's down from $250 to $225 :
(just note that the price difference with Northstars may be partly because of the warranty : Odyssey is 3 years, Northstars (and X2 Power) are 5 years).