Could this be the reason for poor battery life?

overrid3

So i am currently the owner of 2 umi phones since my gf decided she doesn't acutally want the Rome.
Well i have to admit that when i got my emax mini and i saw what was written on the battery i thought it might be a mistake (3.8V-4.35V). Usually Lithium based batteries work at 3.7V-4.2V(full charge).
That until I actually checked what is the voltage at which they are (both) charged.Look at the screenshots and tell me what do you think?
EMAX Mini:

And maybe there's something wrong with the ROME:
Battery:

Charge:

Sometimes it goes a little higher: