What is BATTERY_SWI_CONN does?

Hi there, newbe here, please help me, thanks

what will happen if my battery does not supply power to Battery_swi_conn?

will my iphone battery percentage jumping around?

and also what is HDQ_GAUGE does?

if there is fault on this line, do i have to replace Tigris or can i jumper a cable ?

i asked those question because, my iphone power line/power supply test cable has snapped on Battery_swi_conn line, so every iphone that i tested with it, always came up with a restart problem.

thank you for your help.