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Battery is Fully Charged, But Cannot Power The Phone - Any Advice?

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http://forums.androidcentral.com – I purchased an extended battery, a Motorola branded BP7X for a Droid 2 phone. It's rated at 3.7 volts/1820 mAh. I tested it with a volt-ohm meter and got a reading of 4.2 volts. When I install the battery in the phone and connect the charger (phone is off), the charging graphic shows the battery is fully charged. I can power on the phone with the charger attached, but as soon as the charger is disconnected, the phone dies. I tried this battery in two Droid 2 phones and got the same behaviour. Is this an indication the battery is defective, or is there something I need to do to make the bat (HowTos)