Not sure if anyone else has experienced this yet, but I have now had my Cellular PC for almost a week and have used it pretty heavily. It has drained low, been recharged quite a few times, and only once I accidentally let it die. Well today it seems the battery is super efficient. I took it off the charger this morning around 8:30 AM, and just now plugged it in again for a PC Suite sync-up (the battery bar was full). It immediately came up "Battery charged" and a green light. So for 3 1/2 hours off the charger, it didnt use enough energy for it to even consider itself in need of a charge. Not sure why this phenomenon has happened, but I like it.