Inew v8 is my battery normal using above 4 volts

Hi i recently got a inew v8 and i love it because of its price 150 euro wher i live for that type of phone at that price compared to others that i have seen like nokia lumia 520 150€ aswell
i was amazed.But i found out in time my 2400 mah battery was draining quick with barely anything draining not the screen not even android but in a minute or 2,3 i could loose 1,2 precent and i dont think thats right from a app it told me my phone was using 4 and a bit more volts and it more likely stayed like that but ive seen that the normal is 3.7v.

Question: is it normal and pls know the specs of the phone

Notes:the cpu cant go lower than 714m (normaly 1 or 2 are on,more likely 1).
No apps or anything heavy were running during anything
and some point of precent it stays longer thant normal.
and if i do play any game big,small it goes quicker but not as much.
I will later post more if i find something or remember.
if you want i can say apps that you think i might have that might cause the issue and also i bilieve when i got my phone maybe dont remembet having the issue.

Update:My battery goes 1% every minute
And gets worse when its draining

Thank you