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Unread 03-23-2010, 10:22 AM   #1
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Default Bad Battery

Last night before we went to bed i checked the pack voltage with my voltmeter and it read 50.3 volts. So i left it off charge. Then this morning went to ride it and it shuddered. So checked the pack voltage and it read 40.7 volts. So i put the charger in and it wouldnt come on.

Next i checked the individual batteries. 5 out of 6 read 8.35 volts, #6 read 6.34 volts.

Just got #6 on a 12 volt charger trying to get it back up there, its now at 6.8 volts, still charging (2 amp charging circuit)

What i cant understand is why a battery would go down that quick, without warning at all.

Checked the water level which was fine. SG is way down off the scale.
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Unread 03-23-2010, 10:44 AM   #2
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Default Re: Bad Battery

Batteries do crazy things and without warning sometimes. Shorted cell it looks like with yours.
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Unread 03-23-2010, 10:46 AM   #3
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Default Re: Bad Battery

A drop of 2 volts means one cell is out of the picture. Verify this with your Hydrometer if you like.....
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Unread 03-23-2010, 11:10 AM   #4
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Default Re: Bad Battery

So by charging it with a 12volt charger wont make any difference if the one cell is shot?
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Unread 03-23-2010, 11:37 AM   #5
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Default Re: Bad Battery

Gorhad, sounds like you definately have a bad cell in that battery, charging with a 12v charger won't work in fact it could be dangerous, charging a battery with a bad cell like that could cause it to blow. I have only seen a battery blow once from a bad cell but it wasn't pretty. If it were me I would just replace that one battery.
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Unread 03-23-2010, 03:36 PM   #6
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Default Re: Bad Battery

Called a couple of local dealers, who said it would be best not to put in 1 new battery as the charging cycle could damage the remainder. Anyway the last one said he has a sept 2009 used US battery. Is that OK to put with T875's
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Unread 03-23-2010, 10:17 PM   #7
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Default Re: Bad Battery

It is best to match brand and age when dropping in a used battery. But sometimes ya gotta do what ya gotta do
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Unread 03-23-2010, 10:23 PM   #8
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Default Re: Bad Battery

Gorhad I have 5 exides and 1 trojan in my cart but they are all the same age and they have been workin fine for 3yrs. now.
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