Battery Life Under Heavy Use... - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 4 (permalink) Old 07-13-2009, 04:13 AM Thread Starter
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Battery Life Under Heavy Use...

I bought a brand new battery when I bought the used bike. I've been working on her heavily over the past weeks and I have used the hell out of the battery. What seems to be happening is that it dies rather quickly. My suspicion is that I'm draining it quickly because of the times when I would turn the starter over and the bike would not start up as I was fixing it - and I would crank it and crank it and crank it. Other times I would forget to turn the key off - leaving the headlight on for 5 - 10 minutes. Since it's initial charge I have charged the battery 2 times in addition to the charge I'm giving it now - 3 charges over the past.... month at the least.

Is something else draining my battery? or is it just because in between charges I've coincidentally left the headlamp on for 5 - 10 minutes and been cranking the starter heavily. How long should a battery last under heavy "non motor running" usage?

-J.O'Ly.
'95 Vucan 750 -- VN750

Last edited by SyntaxJO; 07-13-2009 at 04:17 AM.
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post #2 of 4 (permalink) Old 07-13-2009, 04:49 AM
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Quote:
Originally Posted by SyntaxJO View Post
I bought a brand new battery when I bought the used bike. I've been working on her heavily over the past weeks and I have used the hell out of the battery. What seems to be happening is that it dies rather quickly. My suspicion is that I'm draining it quickly because of the times when I would turn the starter over and the bike would not start up as I was fixing it - and I would crank it and crank it and crank it. Other times I would forget to turn the key off - leaving the headlight on for 5 - 10 minutes. Since it's initial charge I have charged the battery 2 times in addition to the charge I'm giving it now - 3 charges over the past.... month at the least.

Is something else draining my battery? or is it just because in between charges I've coincidentally left the headlamp on for 5 - 10 minutes and been cranking the starter heavily. How long should a battery last under heavy "non motor running" usage?
They will drain down very quickly in your situations, a HL on for ten minutes will drop the battery down to 55-60% state of charge which is not enough to start the bike.


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post #3 of 4 (permalink) Old 07-13-2009, 09:54 AM
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Yep, these little batteries are made to give it all they got to crank the bike and get her started, then you need to ride for a while to get it charged back up for the next start. Under normal riding/starting conditions, the AGM battery should last 2-3 years. If you're doing a lot of work on the bike, I would probably purchase a new AGM for when you have it fixed and running good, but continue to use the old one while you do all the work. I don't know how the gel batteries take to being discharged down so low and then recharged often, but I know the little wet cell batteries don't last long doing this. Just my .02!

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post #4 of 4 (permalink) Old 07-13-2009, 05:21 PM Thread Starter
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Thanks guys - I appreciate it.

-J.O'Ly.
'95 Vucan 750 -- VN750
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