The member photo gallery is now integrated and live!!  All user albums and pictures have been ported from old gallery.


To register send an e-mail to admin@bmwr65.org and provide your location and desired user name.

Author Topic: Battery Question  (Read 839 times)

Offline Adrian

  • Lives at Base of Mt. Olympus
  • ***
  • Posts: 520
  • The Old Hairy Biker Sez...
Battery Question
« on: July 29, 2018, 06:52:12 AM »
Hi - I have a 600 watt conversion on the charging system. I currently have an 18aH battery fitted. What size (aH) battery is recommended so that I have a good amount of charge on tap. Thanks.. .
1984 R65 (860)

Offline mrclubike

  • Mt. Olympus Resident
  • ****
  • Posts: 1437
  • Jungheinrich Master Tech
Re: Battery Question
« Reply #1 on: July 29, 2018, 09:18:50 AM »
I don't think you will get much larger of a capacity battery to fit in the stock tray
What people do is strap on an extra battery after the charging failure occurs
A dash mounted volt meter is a must have if you take trips on your bike

The trick is to know as soon as possible that you are having charging problems so you can act accordingly
like shut off the main beam and park where you can push start and figure out how much power it's going to take to get you home
1982 R65 running tubeless Snowflakes
2004 R1150R

Offline Barry

  • Mt. Olympus Resident
  • ****
  • Posts: 5142
Re: Battery Question
« Reply #2 on: July 29, 2018, 10:11:48 AM »
I have an Ultramax AGM battery that's a perfect fit and claims to be 20Ah on a 20hr discharge at 25 deg C. I think they now do a 22 Ah version but I doubt you would find anything with a bigger capacity than that.

You have to be careful with comparisons. For example mine is only 18.2 Ah on a 10 Hr discharge.   10 Hr discharge used to be the norm when quoting Ah capacity but even Odyssey use 20 Hrs now.

« Last Edit: July 29, 2018, 10:12:39 AM by bhodgson »
Barry Cheshire, England 79 R45

Offline Bob_Roller

  • Global Moderator
  • Mt. Olympus Resident
  • *****
  • Posts: 9121
  • -7 hours GMT
Re: Battery Question
« Reply #3 on: July 29, 2018, 11:44:52 AM »
22ah is the largest capacity battery, I've seen as well, for this battery size .

http://www.staabbattery.com/product/UB12220-V.html
'81 R65
'82 R65 LS
'84 R65 LS
'87 Moto Guzzi V65 Lario
'02 R1150R
Riding all year long since 1993 .
I'll give up my R65, when they pry my cold dead hands from the handlebars !!!!!

Offline Adrian

  • Lives at Base of Mt. Olympus
  • ***
  • Posts: 520
  • The Old Hairy Biker Sez...
Re: Battery Question
« Reply #4 on: July 29, 2018, 06:29:13 PM »
Thanks for the info guys  ;)
1984 R65 (860)