Trying to charge 7.2v VEX batteries on a smart charger from BEST kit. Light on charger starts green despite battery not charged. 6.7v according to the voltmeter. No change with fast vs safe. 30 minutes searching and cannot find an answer on VEX site, this forum and general search. Supposedly the smart charger will continue to trickle even when it registers a charged battery. We have 3 batteries, one is charging normally and the other 2 won't charge, no change in the voltage after an hour on charger.