I'm interested in how many hours you sustain the battery at BV 7000pro

Hello admin I have not answered how do you solve a problem with the battery as you promised long operation without charging. My phone lasts only 12 hours, but I have all the machine off, because otherwise did not last even 8 hours. Therefore, I was wondering whether this will update the android with...

Already but you promised us 600 hours of operation 19 hours of talk time of 9 hours of video how you solve it. Will the correction on Android 7. I bought because you do promise long battery life.

I have a new phone and I BV7000pro battery lasts only 12 hours if you turn off all vifi 4g. I was wondering whether you what change the software or appliance I returned to the manufacturer or dealer.