iNew V3 battery problems

[FJP84]

Just had same problem yesterday. A day before y yesterday my phone charged up from 15% - 100% in just 20min. Then yesterdayI was using my phone from 76% (one day of normal use) up and until 55% juice. And then out of nothing it went off...I put it on the charger and battery level was 23%. In a couple off seconds the battery level was decreasing while charging very rapidly. I pulled out the charger from the wall power socket and put it in again. At that moment everything was fine again. So I confused the following:

1. Maybe I need to calibrate the battery or wipe it's statistics. Does anyone have some info on this. I do have a CWM based recovery.

2. Maybe I first need to connect the phone to the charger before plugging it in the power socket. Does anyone have this same issue?

3. Maybe I need another new battery.

Hope someone can help me out.

Thanks again![/code]