I'm not tying to get advice on better brands. I'm not tying to obtain a tiny AA or AAA cree flashlight with hundreds of lumens. I'm just curious about the following, and wondering if anyone knew. I have an older 6D Maglite with a Nite Ize 74 lumen LED bulb. I also have an older 4C Maglite with a Nite Ize 55 lumen LED bulb. Both are running Nimh rechargeable cells. What type of "run time" "battery life" can I expect? What would you think either may be capable of?