UEFI is what is replacing BIOS... It is the bridge between hardware and OS...
UEFI - Bing
Please try the Lumia Software Recovery Tool even though it is older than the WSRT... Use the "phone won't boot or respond" option. If that does not work you will have to seek qualified repair.
You can find LSRT here:
How can I recover/reset/restore my phone software? - Microsoft - USA
Remember, Battery Pulls are a last ditch everything else failed method. They shouldn't be the result of impatience. As you discovered first hand they can damage your system.
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Good luck.