i think thats problem happened after the thermal combound change (not the first time),, the i forget to connect the batery cable to the mainboard...
but i fixed it then and the battery charge normaly...after that th battery charged normally.

and now its stay on 0 % with AC Adapter...but the AC Adapter work and shows green led and the led on the notebook shows in orange
for charge or no charge or not fully charged..only in green when full charged.
i think i want to open it again and check the connector from v battery or ac connection

i will check it again ..

G751?
Original battery pack?
Id say its dead.