(Hey people, first post here, look forward to contribute to the community )
Ill go straight to the problem. I have a *really* old asus x45u laptop without batteries. The old battery gave up but i still have the original circuit from it. So last night i was trying to connect a 12v 5A lead acid battery to the battery circuit, as it calls for a series parallel configuration (12v-6v-4v-Gnd). I would have used 2 separate 18650 battery to provide 4v and 6v. But i accidentally connected the circuits gnd to battery 12v+ and 12v to gnd of battery. So my laptop made a small crickle(?) kinda sound and didnt turn on anymore from the charger. I opened up the motherboard and saw a small smd component with burns around it( see picture) the burnt component while in the circuit measures 13.6 ohm, but i found another similar looking part on the board and it measure .5 ohm. Few google searches turned up that it was some sort of link( am i mistaken?).
So my question is
1. Can i replace/fix the burnt part? I mean if it is a link then cant i just remove the component and solder the 2 pins together?
2. What i originally tried to do ( 12v battery and 2 18650 battery to provide power for the circuit) would it work?
3.imagining it works, can the laptop battery circuit charge the lead acid battery? (4.2*3=12.6v?)