If your T1 is rooted, you can calibrate it by removing the batterystats.bin, if it's not rooted, the next "trick" is sometimes used to calibrate the battery of an Android phone:
1. With the device on, charge it untill the red light goes out.
2. Disconnect the charger and shutdown the device.
3. Connect the charger and charge untill the light goes out.
If this takes more than about 1 minute untill the light goes out, repeat the steps 1-3.
The light should go out within about 1 minute, otherwise the stats in the bin-file don't correspond to the real battery-level.
Allways try to charge with a USB-wall-charger instead via the pc.
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