BMW K bikes (Bricks)

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1Back to top Go down    AGM battery capacity on Tue Aug 22, 2017 2:56 pm

nino


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Hi, I have a problem with AGM battery 12 v/35 ah, 2 years old. From time to time in the morning usualy it wont start the engine. Its spinning too slowly. But always start on bump start and fill the battery regularly.
What is confusing is voltage which is 12,9 volts or even 13 all the time. On idle with headlights on voltage is more than 13 volts. Voltage regulator brand new.
Anybody with similar experience with AGM battery?

    

2Back to top Go down    Re: AGM battery capacity on Tue Aug 22, 2017 4:13 pm

BobT

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It won't be the battery. Probably the battery connectors or starter brushes.

    

3Back to top Go down    Re: AGM battery capacity on Tue Aug 22, 2017 4:49 pm

MartinW

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Probably starter brushes, do the headlight and or indicators act funky. If they do it is one of the signs of dirty starter brushes.
Regards Martin.

    

4Back to top Go down    Re: AGM battery capacity on Tue Aug 22, 2017 5:19 pm

nino


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Headlight, indicators, all electrics function normally. I ll try to clean the starter.
Thanks

    

5Back to top Go down    Re: AGM battery capacity on Tue Aug 22, 2017 6:40 pm

Point-Seven-five

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Clean all your ground connections as well.


__________________________________________________
Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

6Back to top Go down    Re: AGM battery capacity on Tue Aug 22, 2017 11:48 pm

Holister

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Yes. Ground connection for sure. Probably the most important one for the starter is the bed where it bolts down to the gearbox with 2 bolts. It can get corroded under there and this is required by the starter for earthing.


__________________________________________________
1988 K100RT VIN No. 0094680
1989 K100RT VIN No. 0097367 (naked)
1996 K1100RS VIN No. 0451808
Fuel: 95 Octane
Engine Oil:Nulon Full Synthetic 15W50
Gear Box Oil: Nulon Synthetic 75W90
    

7Back to top Go down    Re: AGM battery capacity on Wed Aug 23, 2017 1:36 pm

nino


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It was most stupid reason - loose minus pole on battery. Thanks all

    

8Back to top Go down    Re: AGM battery capacity on Wed Aug 23, 2017 1:53 pm

Point-Seven-five

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The best possible fix! One that doesn't require any expense beyond a little time. cheers


__________________________________________________
Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

Vitamin K

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active member
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Am I to understand that I can lay my AGM battery on it's side? This is a big deal as it will positively impact my battery relocation.


__________________________________________________
Father, Monk, Artist, Rider of the K

Current Ride:
1985 K100RT (slowing morphing into... "something")

Past Rides:
1970 R50/5
1975 R90S
1982 R65LS
    

10Back to top Go down    Re: AGM battery capacity on Fri Sep 29, 2017 12:04 am

Laitch

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@Vitamin K wrote:Am I to understand that I can lay my AGM battery on it's side?
That remains to be seen. Smile
http://www.yuasabatteries.com/faqs.php?action=1&id=27


__________________________________________________
1995 K75T 68,000 miles
    

11Back to top Go down    Re: AGM battery capacity on Fri Sep 29, 2017 7:43 am

Point-Seven-five

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If you are constrained for a battery mounting location you might want to use a lithium battery. They offer a large capacity in a small, light package that can be mounted in any orientation.

If this is a cafe conversion you need it for, I would guess that it would be fairly easy to recoup the additional cost for the lithium based on it's cool factor.


__________________________________________________
Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

12Back to top Go down    Re: AGM battery capacity on Fri Sep 29, 2017 8:09 am

BobT

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The answer is yes, and AGM or gel battery, as they are also known, can be used on its side.

    

13Back to top Go down    Re: AGM battery capacity on Fri Sep 29, 2017 12:40 pm

Dai

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It even states so on the paperwork that comes with the battery. The only no-no is to mount it upside-down - but why would you want to do that!


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

14Back to top Go down    Re: AGM battery capacity on Sat Sep 30, 2017 12:36 pm

Vitamin K

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@Dai wrote:It even states so on the paperwork that comes with the battery. The only no-no is to mount it upside-down - but why would you want to do that!

Thanks all. This AGM I have is considerably smalller than a standard battery. If I lay it on it's side I can put it in the seat cowl, but I want to keep that space clear for my tool roll and tire plugs, so I going to lay it sideways in the current battery tray and make a clean black box to cover it.


__________________________________________________
Father, Monk, Artist, Rider of the K

Current Ride:
1985 K100RT (slowing morphing into... "something")

Past Rides:
1970 R50/5
1975 R90S
1982 R65LS
    

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