I thaught you'd never ask. I had two of them (actually the RX3) in one week. They both went back to the store and were replaced by a Leica LRF900.
All of the fancy doodads and stuff inside isn't worth a lick of salt if the rangefinder doesn't do what it is designed to do - range stuff.
Mine has a temperature read out inside, for whatever reason. I took it out when it was -20, it said it was +12. Because that's what it was inside of my jacket up against my chest..duhhh.
The readout flashes back and forth between the letters TBR meaning "true ballistic range" and _ _ _ which is supposed to be the yardage. So you concentrate your vision on trying to line up the crosshairs on the target and then suddenly the number appears ... and then dissappears because it was too fast for you to change your focal point over to the numbers on the right. I was trying to range some deer in a stubble field. Rumour has it that they have trouble with that.
I could not range a black cow, yes a black angus cow. So, the moral of the story is that I should not hunt black angus cows, or moose, or black bears.
The store was very cooperative though, they did send me home with a brand new one. It was exactly as the old one. So I took it back and got a Leica which doesn't measure chest temperature, has no inclinometer, no true ballistic range, no hold over blablabla but it tells me how far away whatever it is to what I am aiming it at.
Flip the Leupold over on it's belly and what does it say?...made in China.
Ohhh I forgot that you asked about batteries. The Leupold after about 50 or so ranges showed me that it had half battery life left. The batteries are some special thingy that you have to get from Shopper's Drug Mart or some other special place. The Leica has your standard 9 volt battery that we are all familiar with. Moral of the story?....get a Leica.