Boot Loop after replacing the battery

I did the following in vain:

* Ran diagnostics - found no hardware issues reported

* Reset SMC and NVRAM

* Tried booting off of a bootable USB disk with High Sierra

* Tried booting into Recovery Mode and choosing hard disk for start up..

* Internet recovery mode but went no-where

* Don’t see OS X Utilities windows when in recover mode, after selecting a disk

* White ribbon under the apple logo runs all the way to 80 - 90% and the laptop reboots. Sometimes, in multi-language page, says it has encountered a problem and asks for a key to be pressed to continue. Then goes through this loop over and over.

Please help.

Thanks

Dantu