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Topic: How long does it take to charge a dead motorcycle battery?  (Read 21736 times)

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« on: February 20, 2007, 12:36:24 PM »

Ballpark...?
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« Reply #1 on: February 20, 2007, 12:40:08 PM »

Depending on the age of the battery it may not be able to hold a charge if completely dead.
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« Reply #2 on: February 20, 2007, 12:45:31 PM »

It also completely depends on the size of the charger you're using.  If you've got a battery-tender or other similar "smart" charger, overnight should do the trick for almost any motorcycle-battery... certainly no more than 24 hours.
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« Reply #3 on: February 20, 2007, 12:46:23 PM »

Never put a clock on recharging and I only use a tender anyway.  I had a completely dead battery once and left the tender on all night and the next morning it was fully charged.
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« Reply #4 on: February 20, 2007, 01:23:30 PM »

I never put a time on it either I always just did it over night.
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« Reply #5 on: February 20, 2007, 01:34:59 PM »

overnight.
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« Reply #6 on: February 20, 2007, 02:04:46 PM »

If 8 hours on a BT doesn't produce results... I'm inclined toward "infinity."
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« Reply #7 on: February 20, 2007, 02:08:04 PM »

In my case if the battery is dead (will not start in the AM) On goes the tender and off to work I go on one of the other bikes in the garage. When I leave for work the next day the battery is charged, that or I need to get another battery.
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« Reply #8 on: February 20, 2007, 02:10:13 PM »

Look at your battery. If it's a 18 amp battery and you have a 1.25amp/hour charger, and it has no charge it'll take 14.4 hours. So take your batteries amperage and divide by the amps per hour that your charger puts out. I think specific gravity is the best way to test a battery, but putting it under stress works too.
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« Reply #9 on: February 21, 2007, 11:14:16 AM »


Look at your battery. If it's a 18 amp battery and you have a 1.25amp/hour charger, and it has no charge it'll take 14.4 hours. So take your batteries amperage and divide by the amps per hour that your charger puts out. I think specific gravity is the best way to test a battery, but putting it under stress works too.


This assumes no aging (sulfating) of the battery, but is a good initial estimate.  Here is some good information:
http://www.mcnews.com/mcnews/articles/battery.htm
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