Batteries supplied with the remote are out after about six weeks. I think I'll try some rechargeable ones next. BTW, the display brightness was set to 30% (second lowest), and the red glow was rarely used.
UPDATE: When I wrote this a few days ago, the battery indicator was changing color from red to green. Yesterday, the entire display was flashing off and on saying replace batteries or something like that, and it wouldn't do anything. I measured the voltage on the spent batteries, and it was 1.12V (usually when AA's are spent, they're like .7 or .8V). I put them in an MCE remote that I occasionally use with my desktop computer, and they'll probably last there for years.
The rechargeable batteries that I reclaimed charged only to 1.45V (they are designed to operate nominally from 1.2V down to .8V), and the remote only shows four out of five dots on the battery charge indicator. For comparison, brand new alkaline AA'a come charged ato 1.6V. I'm just curious how long these will last in the remote. I hope I won't have to recharge them every two weeks or so.