iNew V3 battery problems

[ahabec]

So maybe I missed some of the messages in the forum and if I repeat I apologize. If not, I'll contribute to the discussion... ;-)
I noticed when charging via USB that the phone hits 4200 mV at 88% and then when it reaches 100% it actually DROPS to 4130 or so!!
Also I noticed via wall charger that when it's at 100% it keeps at 4200.
Indeed like others, the phone charges slowly to 88% and then jumps to 100% in fast increments (or directly from 88 to 100...).

I was using cpu-z to monitor the voltages. The phone is brand new, running firmware iNew V3 1.0.1 (not cxq 1.0.1).

Indeed in use the initial drop in % is fast but then settles.
The battery life is just so-so. For my needs it's ok but I do carry a USB cable in my pocket and plug it into a computer when needed.

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And something else weird: I know this "trick" from my tHl phone.
Charge your battery to full/100%/4200mV.
Switch phone off. Take battery out. Put battery back in. Switch phone on: 78% !!!!!!
WTF??