I recently acquired this iPhone 6 from my Dad as a secondary phone and I feel like the battery life is very poor. I haven't really calculated exactly how long it lasts, but my S7 lasts so much longer than it. I am sure comparing the two is stupid because they run completely different operating systems and have different hardware, but it's just an observation I've made. My iPhone is currently jailbroken at 10.2 if that makes a difference. Today I let the battery run down to 2% (I never really let that happen but today I had no power source to charge from on-the-go) and when I went back home and plugged the charger in (original Apple lightning cable, SAMSUNG adapter) it immediately jumped to 12% so I am pretty sure something is wrong. I downloaded a couple of applications that supposedly give 'accurate' information regarding the cycles and everything and I've attached screen shots below. Any thoughts? Should I try ordering a replacement battery from Amazon or iFixit and attempt a DIY or am I not going to see much improvement at any case? Thanks!