Group 27 AGM mid life performance report
My 90AH Northstar AGM battery is now 38 months old, and has accumulated ~465 deep cycles. When I cycle it, generally I consume 35 to 65AH nightly, average about low 40's Since June of 2015 it ...
Forum Discussion
This shallow cycle 13.7v slow recharge to full being the cause for my 'lazy' symptoms is just guess at this point.
I am doing the same evening/late afternoon shallow cycles now and then plugging in and doing the 14.7v thing afterward, and it is really not taking very long for amps to taper to 0.4. Less time than expected and I will often look over and see it accepting 0.2a, then dial it back to 13.6v.
It does not seem than when one drains from 100% to 95%, that getting back upto 100 percent takes the same time as if one is recharging from 50%, back upto 100%. The 95% to full range appears much different depending on if the batery is coming back up from 50% or coming back up only from 95%
If I do not get any more lazy symptoms doing the 14.7 thing after shallow discharges, then I will put some more merit in my shallow cycle and only 13.6v = lazy battery theory.
Of course this is pretty close to how a battery would be used/treated in a daily driver, and there are not a rash of failing AGMS, but perhaps they are lazy it just never gets noticed as it really reqires so very little of a battery to start a modern engine.
And Who the EFF ( besides us) would ever notice that the amps the battery can accept are not as high as they once were, or that the time it took amps to ataper to 0.5% of capacity was taking too long?
Also have to remember the Northstar and UPG batteries are kind of at the opposite ends of the AGM spectrum.
The personality quirks I notice might not be applicable to AGMS other than the thin plate pure lead of Odyssey and Northstar
Only other AGM I have any personal experience with is a UB12120, a 12Ah agm from a schumacher jumper pack, which lasted pretty good despite my ignorance of batteries way back when.
I am doing the same evening/late afternoon shallow cycles now and then plugging in and doing the 14.7v thing afterward, and it is really not taking very long for amps to taper to 0.4. Less time than expected and I will often look over and see it accepting 0.2a, then dial it back to 13.6v.
It does not seem than when one drains from 100% to 95%, that getting back upto 100 percent takes the same time as if one is recharging from 50%, back upto 100%. The 95% to full range appears much different depending on if the batery is coming back up from 50% or coming back up only from 95%
If I do not get any more lazy symptoms doing the 14.7 thing after shallow discharges, then I will put some more merit in my shallow cycle and only 13.6v = lazy battery theory.
Of course this is pretty close to how a battery would be used/treated in a daily driver, and there are not a rash of failing AGMS, but perhaps they are lazy it just never gets noticed as it really reqires so very little of a battery to start a modern engine.
And Who the EFF ( besides us) would ever notice that the amps the battery can accept are not as high as they once were, or that the time it took amps to ataper to 0.5% of capacity was taking too long?
Also have to remember the Northstar and UPG batteries are kind of at the opposite ends of the AGM spectrum.
The personality quirks I notice might not be applicable to AGMS other than the thin plate pure lead of Odyssey and Northstar
Only other AGM I have any personal experience with is a UB12120, a 12Ah agm from a schumacher jumper pack, which lasted pretty good despite my ignorance of batteries way back when.
