Ok so basically my first gba sp was working fine until it run out of battery and i din't had a charger. So I crafted something different in the battery slot ( i putted a different battery type) and it was working fine. Sice the battery was 3.7 volts i was thinking there would no be some overvoltage or burn insode the gba so it was going fine until one day i tryed to turn it on and it just burned inside. I remond that the right bottom of the gba becamed very hot inside when he died and that all. Today i have a charger and when i try to plug it whit a real gba sp battery this time, the red light turn on and off even if i swap the battery whit another gba sp battery on my first faulty gba sp. ( i have a new one and this time i take good care of it) so yeah i try to see where is the problem on the faulty gba sp now but idk where . what i know is that it maybe resieve to much current flow and it burned somewhere on the power path on the pcb. Sorry if its hard to read, my native language is french.