Try this. When your batteries don't seem to be holding a charge like they use to, completely discharge them and stick them in the freezer for 24 hr. Seems to work as long as the battery is not too old. I was told that if batteries are not completely discharged when recharged they tend to fool the charger into thinking they are charged before they really are. I don't know if its true or not but like I say it seems too work with tool and 2 way radio batteries.

SamC