i’ve had this phone for 3 years i got the battery replaced almost 8 months ago at a battery and bulbs. Not even a week in my phone just started to drain fast during school i’m never on my phone and i stoped using a lightning charger (fast charger) cause it wears the battery out but now it’ll die at 87 it turns off and turns back on and it will be at 4% when i haven’t even touched or unlocked it. I’ve bought a new charger and cube all apple brand, can someone help me because i’m not about to buy a whole new phone.