Is there any diag lights on the battery or the ext power supply *Its good news if you get 2 years out of a battery* I see you say it only sometimes charges Do do you move the unit around a lot? Gharges out of a Known good power supply. Is there there anything else that happened instalation or hardware changes?
interogation over
Do you use this for buisness or personal use?
Check Power and Docking profiles?
How would you feel doing a system teardown?