in any of my detectors. Never liked them when they were NiCad in some models, and don't have a use for NiMH, either.
So now you wonder why?
Maybe, just maybe, I would if I hunted many, many long hours day-to-day, and if I used only one detector most of the time. Then I would be using the one detector enough to wear the batteries and then recharge them nightly, presuming that I leave and return to home each day. But, I don't. I make use of several detectors, one Tesoro, one Teknetics, and two White's (the MXT Pro and VX3) and due to my health ad other keep-me-busy things, I can't get out as often or for the durations I would like. For ME, a good set of AA alkaline batteries work a good long time and I can better monitor when they are wearing down and be ready for a quick replacement. Besides, I use AA alkaline batteries in some of my flashlights, back-up radios, hand-held communication radios, so I have plenty of alkaline batteries on hand.
Another thing that I didn't like about rechargeable batteries were that they didn't last as long as alkaline batteries. My run-times were much shorter. Second, they didn't alert me to being 'run-down' as easily as an alkaline, and I prefer the informative behavior od run-time of alkaline batteries. Third I used them a little early-on, and have hunted with several people who rely on rechargeable batteries , and all too often I have seen the get well away from where we are parked out in a remote site, only to have the rechargeable pack die-off quickly, as rechargeables do, and they are inconvenienced.
I mainly hunt ghost towns, homesteads, and many other old and out-of-the-way locations, often spending a night or two away from any power source to recharge the dead batteries.
I made the long trek back to the vehicle, and I still see many who are bothered to interrupt their hunting time due to the shorter run-time and quick drop-off in power of rechargeables. In those early-day experiences I would always walk back and switch to my 8-AA alkaline pack. I then had full power and I could hunt much longer with them than rechargeable packs, and it didn't take long for me to eliminate that annoyance and simply stick with AA alkaline batteries.
Just my experiences over many, many years.
Monte