If your worried about battery life the 2s can charge (it has pass through apparently but it's not advised to use it) but also if you put the right battery in then a full day shouldn't be an issue,
These are the 
batteries I use in my ipv2 and how long they last
Keep in mind I am a chain vaper and I run nautilus 
tanks with 1.8ohm bvc's @8w and an Atlantis 0.5ohm at 22.5w so I chew through 
batteries
Vtc4 2100mah - 5-6hrs
Samsung 2500mah - 8-9hrs
Efest 3100mah - 15-16hrs
To put it into perspective for you, I run an mvp into the red on an average day