Notebook only works on AC power

[checkers 0]

My Evo N620C shuts down immediately after pulling out the power cord.

The battery is fully charged, and the same battery works just fine in my second unit.

I completely disassembled the machine, and found nothing loose etc.

When reassembled, it again shut down when unplugged from the AC power.

[Myke 0]

You said you tried the battery on the second unit and it worked fine. Did you try the battery from the second unit on the unit in question? If a second battery does the same thing, there may be an issue where it is not reading the battery. Check the connections from the battery to the notebook.