Time to do a little troubleshooting......First you didnt say what class the battery is, but I wouldnt trust the meter on most chargers, check the battery voltage prior to charge, then again when the charger indicates full charge. This will tell you if the battery is good and if the charger is working as it should.
I attached a battery volt/% chart. If you don't have a DMM you can pick one up most anywhere you dont need a 300 dollar meter for around the house/shop harbor freight has them for under 10 bucks........Name: Battery_charge_state.jpg Views: 1118 Size: 47.0 KB