I use Energizer nickel metal hydride (NiMH) 2500 mAh batteries in my Eton E5. The radio would not stay on tonight, so I decided to check my records and determine how long they actually lasted.
According to part 1 of my July 2006 reception reports, I had just put fully charged batteries in my E5. Tonight, I switched on the radio and it powered off after a few seconds due to depleted batteries.
My reception report notebook tells me when the E5 was first used in July (which would be when the new batteries went in). I can also determine how many hours of use the E5 had.
The recharged batteries went in on 03 July 2006. They were depleted on 15 August 2006, which is 44 days later. According to my notebook, I can account for 3 hours and 22 minutes of usage with that set of batteries.