Do you leave wifi on in the car? What is your screen brightness set to?
I downgraded back to 2.1. With 2.1, I can leave Wifi ON, and keep my screen at full brightness, and my battery charges like a champ! It works great! When I had Froyo 2.2, nothing I would do would be enough to keep the battery charging using the navigation program. I disabled Wifi, Always On Mobile connection, etc, and nothing. Froyo changed the charge rate too low. I even tried a factory reset as a last resort, with no changes. Was still losing a charge.
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