The New And Improved Unofficial R65 Forum V2
Technical Discussion => BMW Technical Q&A, Primarily R65 => Topic started by: MrRiden on November 21, 2018, 06:12:50 PM
-
I'm about to pull the trigger on a UB12220 battery from Amazon but was wondering about charging. Is there anything I need to be aware of or can I toss this on my Battery Tender Jr / 30 yr old sears charger without causing an unfortunate event? Thanks.
-
Battery tender will work fine on the AGM battery .
You don't have to keep it on all the time the AGM's don't discharge as fast as a flooded type battery .
Don't use a trickle charger, they never stop charging .
-
Even if you only use the bike once every 2 weeks an AGM battery won't need charging and I agree with Bob that it's not a good idea to keep them permanently on trickle charge unless you are very confident that the charge voltage is matched to the battery. I wouldn't do it simply because with an AGM it's unnecessary.
As to charging your new battery when it is necessary, any charger will do provided the recommended charge voltage of 14.6 - 14.8 volts is not exceeded. The voltage must be reduced to 13.6 - 13.8 volts when they reach full charge. An unregulated charger can damaged an AGM if the voltage is allowed to remain too high.
http://files.upgi.com:8086/UPGFileService.svc/GetSpecSheet/40582
-
The only reason I put my AGM on the charger is when I am going to start the bike when it is below 40F just so it has more power to crank the motor over with the Bosch starter
In Arizona I don't see a huge need for a battery tender
AGM's do like a higher charging voltage than a normal flooded battery like 14 to 14.5
I run my Odyssey at 14.6
Odyssey recommends up to14.8
-
The AGM really likes it colder
Looks like the hotter it is the more they discharg
-
Heat shortens the life of battery .
The average service life of a motorcycle battery here is 24-30 months .
Auto battery 36-40 months .
That's why I've gone to generic AGM batteries .
The last Odyssey battery I had, lasted 19 months .
-
A useful chart posted above by Mrclubike. It gives a clear indication of when to charge a battery in storage. In my climate I'm good for 6 months minimum but at 30 Deg C only 3 months. A normal wet cell battery will discharge a lot faster though so an AGM is still the way to go.