Battery issue

Rols

Rols

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So my friend hooks up a charger to his 78 Kawa while never removing the battery from the bike...

after a night, after the charger declares the batter 'full'', when we go to start the bike there is absolutely no response... as if the battery is dead.

is the battery a write-off? or is it just fuses?

any help would be great

thanks

ped
 
Maybe the battery was already toast before you put the charger on it. After all, if the battery was already charged, why put a charger on it in the first place?

It's also possible that the charger may have toasted a battery that was still good before you tried to charge it. What kind of charger did you use and at what charging current setting, and for how long?

To find out if the battery is a write-off, put a volt-meter on it. A freshly charged battery should show at least 13 to 13.5 volts immediately after removing the battery charger. A battery that has had a chance to sit for a while after charging should still show at least 12.6 volts.

If good so far, try pressing the starter button for a few seconds, then check the battery again. It should still be at least 12.6 volts.

If your battery shows good voltage and nothing happens when you push the start switch, then you have some sleuthing to do. Use your voltmeter to check voltages at your battery, at your starter relay, both sides of each fuse at the fuse block. See if voltage makes it to the connections on your starter button.
 
My battery did the same thing. Couldn't tell you why.. but it was dying slowly from last season. I had the tender on it and it said full for weeks, but wouldn't crank at all. Changed the battery and all is well :).
 
ONLY way to test a battery is to load-test it.
The load-tester is a hand-held device that connects to your battery, then you press the button and watch the meter.
The meter will tell you if the battery "answers the call" when the full battery output is requested.
If your battery passes load-test, the load-tester will become quite hot in the process, as it turns a great deal of amperage into heat.
I have seen many batteries, new ones, fancy ones, even high-end Yuasa MF, all flunk load-test.
They are then officially junk - but the good news is, there's nothing wrong with the bike's charging system...
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