Something "funny" happening to me last week. Both mine & my wife's Note 4 battery going kaput. I bought my wife's on 24th October last year & mine around 3 weeks after that. While connected to the charger, it can be turned on but once disconnected, it will having never ending series of bootloop, stuck at Samsung logo & then restart itself again & again. Planning to get Note 5 at the end of this year but now I'm afraid of the same thing happens with sealed battery. The repair cost will of course high if it off warranty.

Now planning to buy new battery, but just AAA as the original one too expensive. Does anyone using AAA Note 4 battery before? Does fast charging works well with this battery?