Replace the thermal paste behind the CPU shield (yes, it dries out) and install Kernel Adiutor to underclock the CPU to 800Mhz – you won't notice the speed drop, but the battery will last 2 days.
If you want to give this phone a second life without the laggy Samsung TouchWiz, here are the current best custom ROMs. galaxy j5 2015 custom rom
Hey everyone! I know the Samsung Galaxy J5 (2015) is ancient (Snapdragon 410, 1.5GB RAM), but it’s a legendary device because of its removable battery and excellent . Replace the thermal paste behind the CPU shield