Tabs 10.5 faiure after battery install

Hi I have a Galaxy tab A 10.5 that suddenly started to flatten the battery within a few hours playing casino games over the last couple of days before it failed. Would not accept any Charge Wound not boot. Tried everything

Power and volume buttons etc etc Nothing.

Bought a battery for it. Original. Still no boot no charging icon either. There was 4 volts present on the motherboard near the battery.

Wonder if it’s cooked. Any ideas anyone please?