i got iphone 6 on launch day in 2014. year i've noticed battery abnormally touchy when comes temperature. few times @ friend's house in garage , while i'm using phone shut off if battery dead. since attributed cold, i'd put in pocket few minutes warm up, turn on , display had plenty of battery life left (sometime 30%-40%). last night wasn't particularly cold , when got home plugged in , battery jumped 20% 40% , wasn't below 40f. i've calibrated battery multiple times in past few weeks (using until shuts off @ 1% , leaving charge overnight) , seems same situation. charge every night, don't remember iphone 4 or 5 every being touchy when comes temperatures still within operating ranges. i'm guessing how thin casing , battery more sensitive, has been noticing more? no apple care i'm pretty carrying around battery bank @ least until weather warms more and/or 7 released year.
it's not temperature. battery has bad cell. replaced.
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