Yeah it came with 2 little cells in a bag..
It's nice to be able to check the readings without being plugged-in.
The display does time-out pretty quickly. Battery saver I guess.
Just got a reply from the dealer.. Will post about it later.
Edit: 18:24 7/18/12
The dealer wants me to send them back. But, I want to do more testing.
I'm running them on my Plasma HDTV and my refrigerator.
If the 'watts' display still hangs up, I'll have to return them..