"They claimed 48h with the Turbo and no way I'd ever make it that long with normal use."
Technically, I think they claimed "up to" 48h. The Droid 2 seems to be a true 48h claim. We'll see how that holds up in practice. Also, we don't know how they substantiated that claim. I haven't seen any explanation or disclaimers but their is obviously a cap on how much talk time and screen time in that 48h claim.
Is the 810 more efficient? I've heard it gets hot which suggests it is inefficient.
Straight from the Droid Turbo (1) product page: "Mixed-usage up to 48 hours". It's always been "up to", same for the Maxx, etc. If you sit & play games on it constantly, it's not going to make it that long. If you've got apps that run a bunch of stuff in the background constantly, you're not going to get that much. If you are in an area with lousy cell coverage, you may not get that much.
This is from the fine print on the Turbo 2's product page:
"5 All battery life claims are approximate and based on a standard mixed use profile. The mixed use profile is based on Motorola devices on major 4G LTE networks with excellent coverage and includes both usage and standby time. Out-of-box settings are applied to the mixed use profile to project battery performance. Actual battery performance will vary and depends on many factors including signal strength, network configuration, age of battery, operating temperature, features selected, device settings, and voice, data, and other application usage patterns."
Be glad it's not a claim that's under ideal conditions, but at least it's from some kind of average conditions testing. I use my Maxx harder than average, so I don't get upset that it doesn't last 48 hours. I've just been very happy that it has no problem getting through a long day of heavy use. On the Turbo2 vs Turbo1, we're talking about about a 3% smaller battery. I think it's pretty silly to get all concerned about that tiny of a difference, as if it's going to result in a noticeable difference in real world use, especially when paired with different (more efficient) components and software.