hello. my device is the xperia e4g and i have unistaled all the bloatware and made it super "slim" no facebook,google store,gmail, gps etc. so from time to time i play only chess,without any other app to run at same time. the bettery drains normaly and its very very good(only after several hours of play can reach 20% from 100%) until 20% the battery is super.now when reach the "magic" 20% something strange is happening: shows a warning window saying your battery is low etc,and suddenly drops fast from 20% to 15 10 and 5% within 2 mins! and shut down.the device is a little warm but not hot (summer here,room temp 25c with A/C on) so when i charge it after 2-3 mins its shows 22-23% !!!.today i made a factory reset to see what will happen again. notice:during the winder when reached 20% the only effect was a perfomance decrease to save battery time. seems this device has a battery limit at 20% ,but why on the summer this fast draining?