How long it takes to lose your battery - MVAgusta.net
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post #1 of 17 (permalink) Old 01-14-2008, 01:34 AM Thread Starter
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How long it takes to lose your battery

It was a rare 80-degree day in the SoCal winter today, and while I spent the day riding, I decided to stop by the office to answer some e-mails (I think I have become a workaholic).

Well as I parked the bike, I commited that dreaded mistake of over-turning the key to lock the bike, and it went into the Parking light.

I was gone for just a tad bit over an hour, came back, saw the lights on... oh shit... and it's a Sunday afternoon, there is NO ONE around, and the roads are flat in this part of Irvine.

My bike is still new and I'm busy breaking it in, so at least now I know it takes at least that long (a little over an hour) to run the batteries out, despite still a new battery.

By a sheer stroke of mind-boggling luck, the only ONE single staff member of the office who knows about motorbikes walks in to do some work (or not)... and he gave me a proper push start, which brought the MV back to life. I nearly hugged him for saving me from all the hassle.

Just a quick question to those of you guys who know more about this stuff... had I had LED lights installed, would it have made any difference how quickly it would have ran out??
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post #2 of 17 (permalink) Old 01-14-2008, 03:59 AM
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wow, it died in just over an hour from the parking light? geez.

sorry, but no idea on the LEDs.


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post #3 of 17 (permalink) Old 01-14-2008, 04:30 AM
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In theory the LEDs should draw a lot less power from the battery than normal filament bulbs do, so logic says that the battery should last longer. Although it sounds like the battery either has a problem or wasn't fully charged and should last a lot longer than a hour or so.
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post #4 of 17 (permalink) Old 01-14-2008, 06:24 AM
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I think the factory battery is pretty weak, and just doesnt hold a charge very well.

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post #5 of 17 (permalink) Old 01-14-2008, 07:12 AM
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don't forget it's only a 12? amp hour battery, that means it will give 1 amp for 12 hours, 12 amps for one hour and any other combination like 720 amps for 1 minute,
If you keep in mind that it probably takes a load of 300amps on initial start and 150 amps continuous to turn the engine over it won't take too long with lights on to drain the battery until it can not supply these high current loads.

3 parking bulbs at approx 7w rear and 2 x 5 w front = 17w divide by 12v=1.4 amps, or the park lights alone will totally flatten the battery in a little over 8 hours

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Last edited by mikef4uk; 01-14-2008 at 07:15 AM.
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post #6 of 17 (permalink) Old 01-14-2008, 07:24 AM
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Quote:
Originally Posted by mikef4uk View Post
don't forget it's only a 12? amp hour battery, that means it will give 1 amp for 12 hours, 12 amps for one hour and any other combination like 720 amps for 1 minute,
If you keep in mind that it probably takes a load of 300amps on initial start and 150 amps continuous to turn the engine over it won't take too long with lights on to drain the battery until it can not supply these high current loads.

3 parking bulbs at approx 7w rear and 2 x 5 w front = 17w divide by 12v=1.4 amps, or the park lights alone will totally flatten the battery in a little over 8 hours

wow, been a while since i've done physics. did some quick napkin math and i think i agree with you. tho after a couple bottles of wine, it's a bit fuzzy.



but damn, useless lights then. Anybody actually use these things? (on purpose?)


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post #7 of 17 (permalink) Old 01-14-2008, 09:50 AM
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I am no electrician but I do have experience with LED's. They draw less power and in theory should take a longer time to drain the battery.
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post #8 of 17 (permalink) Old 01-14-2008, 12:34 PM
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My stock battery with the MV and 999 lasted less than a year with frequent (almost everyday) usage. I agree with the theory that the battery may not have been fully charged to begin with -in addition the fact they're pretty weak. A few weeks ago, my MV battery would be fine one and dead the next - so I just replaced it. I think a trickle charger on these bikes is a must.

I also heard that once a battery is completely drained and needs a recharge, it's never 100% again. Something about electrolites not sticking to the plates?
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post #9 of 17 (permalink) Old 01-14-2008, 12:40 PM
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Different forms of batteries have different recovery capabilities. The Stock MV battery is pretty good if kept on a charger. I'm surprised that you were able to push start it. Once the ecu reads less than 12 volts, it won't fire the injectors. I'll bet you won't make the same mistake. Only did it once on a bike, and that was many years ago.
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post #10 of 17 (permalink) Old 01-14-2008, 02:36 PM
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I think it must be a DOT regulation kind of thing. No one ever uses the Parking Light function (kills batteries) but every street bike sold in the US has it.

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