Rash of AGM Batteries on C-list claiming reconditioned

M-technik-3 · 01-27-2023, 02:41 PM

I'm not up on the technology of AGM's but I know they should last a decent period of time. Why would putting them on a 10 amp charger for a few hours recondition them. How long should one last?

chassis · 01-27-2023, 04:15 PM

If you are considering buying a battery from Craigslist, don’t do it.

tranquility · 01-28-2023, 12:30 PM

Mine lasted 8 years, which I believe is normal. It is apparently a tricky job somehow for my car, the tech completely screwed up my trunk door (couldn't close properly afterwards) and the master tech had to step in.

3.0L · 01-30-2023, 04:51 PM

I've never heard of a reconditioned AGM battery, or any other type battery. Recharged is probably the correct term, and even that can only go so far with an old battery.

I replaced the AGM battery in my M235i at 7 years. The battery still worked okay, but I decided to be pro-active and not get stuck somewhere. I bought an OEM battery from my BMW dealer plus ordered one of those ODBII devices to "register" the battery to the car computer. Easy job, actually (just don't close your trunk lid with the battery disconnected or removed).

wdb · 01-30-2023, 05:03 PM

CTEK chargers/maintainers have a recondition cycle that is supposed to bring batteries back to life. (I should knock wood when I say this but) I ran the dying AGM battery in my 2007 E93 through that process -- took over a week -- and it is still working now, 4 years later.

BMWCCA1 · 01-30-2023, 06:52 PM

I wonder if they could be warranty cores from a dealership that followed the techs home?
Just sayin' . . .

01-27-2023, 02:41 PM	#1
M-technik-3 Lieutenant Colonel 2426 Rep 1,631 Posts Drives: E30 M3, E36 M3, 328iT, 335i Join Date: Mar 2020 Location: western Ma iTrader: (0) Garage List 1995 M3 [9.00] 2007 E91 [7.25] 1988 M3 [9.50]	Rash of AGM Batteries on C-list claiming reconditioned I'm not up on the technology of AGM's but I know they should last a decent period of time. Why would putting them on a 10 amp charger for a few hours recondition them. How long should one last?
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01-27-2023, 04:15 PM	#2
chassis Colonel 8004 Rep 2,495 Posts Drives: 9Y0 Cayenne S Join Date: Mar 2019 Location: Einbahnstraße iTrader: (0) Garage List 2020 Porsche Cayenne S [7.69]	If you are considering buying a battery from Craigslist, don’t do it.
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01-28-2023, 12:30 PM	#3
tranquility sportscars only 3463 Rep 3,268 Posts Drives: 2011 Z4 sDrive 35i Join Date: Aug 2007 Location: Montréal iTrader: (0)	Mine lasted 8 years, which I believe is normal. It is apparently a tricky job somehow for my car, the tech completely screwed up my trunk door (couldn't close properly afterwards) and the master tech had to step in. __________________ The richest one percent of this country owns half our country's wealth, five trillion dollars. One third of that comes from hard work, two thirds comes from inheritance, interest on interest accumulating to widows and idiot sons and what I do, stock and real estate speculation...It's bullsh*t. I create nothing. I own. We make the rules, pal...Now you're not naive enough to think we're living in a democracy, are you buddy?
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01-30-2023, 04:51 PM	#4
3.0L Colonel 10829 Rep 2,011 Posts Drives: 2014 BMW M235i, 2024 GLC300 Join Date: Apr 2014 Location: California iTrader: (0)	I've never heard of a reconditioned AGM battery, or any other type battery. Recharged is probably the correct term, and even that can only go so far with an old battery. I replaced the AGM battery in my M235i at 7 years. The battery still worked okay, but I decided to be pro-active and not get stuck somewhere. I bought an OEM battery from my BMW dealer plus ordered one of those ODBII devices to "register" the battery to the car computer. Easy job, actually (just don't close your trunk lid with the battery disconnected or removed). __________________ 2014 BMW M235i 2024 Mercedes Benz GLC300 Expert ultracrepidarian
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01-30-2023, 05:03 PM	#5
wdb dances with roads 5075 Rep 4,130 Posts Drives: '07 E86, '02 996, '95 Seven Join Date: Jul 2015 Location: the perimeter iTrader: (4)	CTEK chargers/maintainers have a recondition cycle that is supposed to bring batteries back to life. (I should knock wood when I say this but) I ran the dying AGM battery in my 2007 E93 through that process -- took over a week -- and it is still working now, 4 years later.
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01-30-2023, 06:52 PM	#6
BMWCCA1 BMW Owner Since 1971 2504 Rep 1,519 Posts Drives: 1964 700 Sport Cabriolet Join Date: Apr 2014 Location: Central Virginia iTrader: (2) Garage List 2013 BMW 128i [10.00]	I wonder if they could be warranty cores from a dealership that followed the techs home? Just sayin' . . .
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