Join Date: Feb 2006
Location: Denver, CO
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Hey, all you need to do is take your battery to Auto Zone or Advanded Auto, any place really, that sells batteries. they can put it on their battery charger and see if it is any good. I have done this many times. It is free of charge and if your battery is still good, then you walk away with a fully charged, known good working battery.
That being said, since you have charged your battery at home on your charger, and it works for a while on your bike and then doesn't, it seems to make sense that your bike is either, shorting out somewhere and draining the battery faster than the charging system can charge the battery, or it is not charging at all. I suspect the latter and would attribute this problem to the rectifier.
What year is your bike? I know the 03/04 model year had a problem with that particular part overheating and malfunctioning. This problem was resolved on the 05/06 model and surely the 07's as well.
Good luck mang...
2005 CBR 600RR
PCIIIUSB; Yosh RS-5; 520 conversion (vortex and RKXSO) Homemade FE, OEM seat cowl.