Battery voltage test - BMW Luxury Touring Community
 
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post #1 of 3 Old Apr 27th, 2010, 9:32 pm Thread Starter
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Battery voltage test

My battery is about 20 months old and it is acting up
It is a BMW gel.
Symptoms are if I let the bike sit for two days it wont start. I put it on the charger and all is well. In addition if I ride daily no problems.

My question is what should be the voltage of the battery at rest, nothing on and then with the bike running. Also is there a RPM that I should check the voltage at?

Thanks for any help.

G-Glove
2003 Silver LTC
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post #2 of 3 Old Apr 28th, 2010, 1:24 am
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Re: Battery voltage test

Typically, a 12V battery will read between 11.7-12.7 volts at rest. With engine running and no heavy loads turned on, voltage should read 13.7-14.2 volts. There will be slight variations depending on battery age, battery type, temperatures, etc., but anything close to these ranges would indicate a normal system.

An ignition off battery draw test would be the next test to do, but you need a meter that will read low current do do that. The test is to pull off one battery lead and put the low amperage meter between the battery and removed lead to read how much current is flowing with the ignition off. Anything over 100-200 milliamps would be suspect.

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post #3 of 3 Old Apr 28th, 2010, 12:44 pm Thread Starter
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Re: Battery voltage test

Quote:
Originally Posted by dshealey
Typically, a 12V battery will read between 11.7-12.7 volts at rest. With engine running and no heavy loads turned on, voltage should read 13.7-14.2 volts. There will be slight variations depending on battery age, battery type, temperatures, etc., but anything close to these ranges would indicate a normal system.

An ignition off battery draw test would be the next test to do, but you need a meter that will read low current do do that. The test is to pull off one battery lead and put the low amperage meter between the battery and removed lead to read how much current is flowing with the ignition off. Anything over 100-200 milliamps would be suspect.

Dave thanks for the advise.

G-Glove
2003 Silver LTC
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