Used 4-AA Sanyo Eneloop NiMH rechargeable batteries on my MX-450. They lasted almost the same length of time as my previous remote, the URC-300 using 4-AAA Sanyo Eneloop NiMH batteries - 4 months.

I expected a longer life considering they are AA batteries.

I use the following settings on the MX-450:

Color Display:50% brightness & 5 sec. auto turn off

Button Lighting:Auto on is inactive & 5 sec. auto turnoff

Also, I rarely use the light button on the side of the unit.

I also decided to give the Energizer Ultimate Lithium 8X AA batteries a try. So far after two months of use they are still reading 100% charge. These batteries may last over one year.

Does anyone know how long ordinary alkaline batteries last in the MX-450?

I am sure glad that I don't have to deal with the built-in rechargeable batteries on other remotes such as on the 810, 880 & 980. I hear that they are real pain requiring a charge every 2-3 days.