Like the G4, the battery life of the V10 is pretty horrible. There's no getting around it.. the main culprit is the Quad HD screen, which IMO is completely useless on a smartphone. I've used just about every high end phone for an extended period of time with the exception of the HTC One M9.. the best screen I have seen on a phone to date was the Sony Xperia Z3+. Simply stunning.. the brightness, colors, and clarity puts my G4 and V10 screen to shame. And it's not quad HD resolution, and the battery life of that phone is significantly better even with a slightly smaller battery. There's seriously no reason for a Quad HD display on a phone, other than for bragging rights. There's not enough 4K content available now to justify it, and even if there was it wouldn't be worth it IMO.
I can't understand why the V10 wasn't able to incorporate a larger battery. Upon opening up my V10, I was expecting it to have the same battery as my G4 since it was the same manufacturer and size, but the different batteries are not compatible. The V10's battery is noticeably bigger, which is why I don't understand why they couldn't make it a 3200mAh or something similar.
I was expecting the battery life of the V10 to be worse than my already terrible G4 due to the second screen and larger 5.7" main screen, but I was willing to accept the trade-off with the addition of the fingerprint sensor, which really should have already been on the G4 in the first place.