How to test Nintendo Switch motherboard and battery - unknown conditio

Hi there :)

I’ve purchased few not working Switches and trying to create just one good one.

what is needed to connected to motherboard to be tested.

at the moment I got connected LCD and touch screen and battery - on display I just see battery symbol only and “lightning”

it is charging with about 0.46A for about 10 minutes and nothing

is it normal or battery was so discharged I need to wait 1 hour?

chip is warm in touch but can it be burned if no radiator and fan if it will switch on?

if motherboard (or charging chip) would be broken - would I see that battery symbol?

thank You for help :)