Both with USB and my external charging i reach 95-100% so that 80% limit is not whats wrong.

And the battery's will last long enough at 100% (4.23V).
For the most cycle life 4.15V is the max is should be charged to which is about 90%

80% is 4.00V, and in the end of the day those 10% extra can be needed if you are running a "single" battery (less then 1500mAh)