iNew V3 battery problems

[Burs]

So it could be the phone is very sensitive to quality of charger and cable. That's interesting.

No, not interesting. That's smart
I would say charger and/or cable are more probable reasons, because I know from experience that China phones/tablets have crappy chargers. On my last tablet I had to replace the original charger twice, and third time I bought non-original one with the same specs, but a quality one. Since then, no problems so far. Let's see how testing goes with everything said in this thread...