Is there a way to test a battery charger? I got a Battery Tender not more than 2 months ago and I think it's already on the fritz. It seems like it's not charging my battery all the way. As a result I've had the end of some of my commutes be a little scary 'cause my light was so dim. Last night I left my light on to totally drain my 10Ah SLA battery before hooking it up to the charger. The Battery Tender said it was fully charged in about 2 hours....heh...I don't think so! Any ideas?