I have an XTar WP2. When you plug in the charger, the lights are green and then when you insert a batt that needs charging, it turns red while it charges and then green when its done. Now, it stays green and never indicates that its charging with a battery in place, even though I know they are dead or near dead. It happens in both bays and Ive tried with 6 different batteries. Contacts are clean. Any ideas? I dont have a meter to measure voltage. Maybe I should pick one up.