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  #1  
Old 11-21-2017, 11:13 AM
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another battery thread-go AGM or not

anyone got experience with the agms batteries? can a same rated one be used in our X5's? or is it as I read somewhere that modern cars alternators churn on slightly more V that is needed for the agms? and that 'older' non start stop cars e.g the X5 alternator gives out anywhere from 13.6 -14.1?
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Old 11-21-2017, 12:39 PM
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Put one in my X few months ago. I thought the AGM was the standard battery for them so not sure why it would be an issue.
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Old 11-21-2017, 01:27 PM
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I bought this Duracell H8 AGM battery several months ago and it is doing very well. I have no issues and all appears to be working well.

I would have a hard time believing that AGM manufacturers would bring a product to market that was not compatible with the vast majority of in service alternators that more than likely were in service long before the AGM technology emerged.



https://www.samsclub.com/sams/auto-g...lp:product:1:1

Specifications:

20 amp hour rate:92
Battery electrolyte composition: Glass Mat
Battery end type: Top post
Battery purpose: Starting lighting instrumentation
BCI group size: 49
CA at 32 degrees F: 975
CCA at 0 degrees F: 850
DIN code:H8/L5
Freight class: 65
Polarity: Right positive
Reserve capacity: 170
Terminal typeIN
Volts: 12

Mike
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Old 11-21-2017, 01:58 PM
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Been using the Deka 9AGM49 or 9AGM94R for at least 10 years in an E53 and E46. No issues at all.
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Old 11-22-2017, 02:27 AM
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Originally Posted by Scott ZHP View Post
Been using the Deka 9AGM49 or 9AGM94R for at least 10 years in an E53 and E46. No issues at all.
That good enough proof for me fella that agms are ok in older X5s without the start stop system, another quick question the agms i find out here all refer to start stop battery , would this be an issue or is it safe to assume start/stop=agm battery?
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Last edited by omodos; 11-22-2017 at 05:24 AM.
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Old 11-22-2017, 03:03 AM
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cheapest branded one i could find out here is this, 247 EUROS, and going by the flyer from a reputable dealer good chance they have been sitting around since feb when flyer was put on web....hmmm
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Old 11-22-2017, 08:54 AM
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Originally Posted by omodos View Post
cheapest branded one i could find out here is this, 247 EUROS, and going by the flyer from a reputable dealer good chance they have been sitting around since feb when flyer was put on web....hmmm
That's one benefit of AGM; they don't self discharge nearly as fast as wet cell/lead acid batteries.

I spent 9mos working in Europe a while ago; my E46 fired right up when I returned.
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Old 11-22-2017, 09:04 AM
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Originally Posted by Scott ZHP View Post
That's one benefit of AGM; they don't self discharge nearly as fast as wet cell/lead acid batteries.

I spent 9mos working in Europe a while ago; my E46 fired right up when I returned.
Interesting, thanks for info, my hope is they charge up faster too on shorter trips cos I think that is my main issue, dont drive the x enough and over the space of a week the battery is sapped of juice...i charge it up with a ctek and off I go again for another week...this seems most prevalent now temps have dropped and am hoping the agm will charge to sufficient levels on my short trips compared to a normal wet battery

PS alt pumps pout 13.9-14.0 driving and also idle just a tad lower/& sleep mode draw is like 0.05amps
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Last edited by omodos; 11-22-2017 at 09:09 AM.
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Old 11-22-2017, 03:00 PM
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Whatever brand and species of batt that you get, I rec'd putting it on a low amp 'maintenance' type charger before install...

Even here in the US, batts sit on shelves for awhile, and in your location they may have been sitting longer.
A nice slow low amp charge to bring that new batt up to full tilt boogie is better than a new batt off the shelf, installed and driven away, in my experience.
GL, mD
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Old 11-23-2017, 02:12 AM
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Originally Posted by motordavid View Post
Whatever brand and species of batt that you get, I rec'd putting it on a low amp 'maintenance' type charger before install...

Even here in the US, batts sit on shelves for awhile, and in your location they may have been sitting longer.
A nice slow low amp charge to bring that new batt up to full tilt boogie is better than a new batt off the shelf, installed and driven away, in my experience.
GL, mD
Indeed have heard this quite alot thanks, I guess my best bet is to wait see what new stock/flyers the sellers pump out, and then go after one of the 'new' models specifically, my current bosch S5 plus normal lead acid I am convinced was sitting on the shelf for at least a year and there is no way of telling if reseller was periodically maintaining the stock....i doubt it
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