How long do the phones go before you start seeing the battery dying?
With my BlackBerry Bold 9780, it was probably closer to the 18-month mark.
My BlackBerry Q10 was fine!
Had that for maybe 11-14 months. It lasted a while longer with my brother until it started to have battery issues/glitching.
My Nexus 5 was around the 12-14-month mark.
My LG G3 lasted maybe 4-6 months before the battery started giving me trouble. An update seemed to fix it but it came back and I suffered with it. Should've replaced the battery or something but I was never sure if it was software (maybe, since an updated stalled the battery issues) or a hardware issue.
And so far, my Honor 8 is doing well, at the 11-month mark.