Are you sure it didn't charge to 100% and then stop, and start discharging again.. it does that... then when it's drops to c.90% (doesn't seem to always be exactly 90%) it starts charging again..Left my my phone charging all night, and it didnt even fully charge to 100% it was hovering around 95~ still had the orange LED on :s
Thing I found odd is that it discharges quicker when it's plugged in (after completing the charge) than it does when it's not plugged in.. seems the "charging manager process" is preventing the phone from sleeping.