[wdfifteen]

What Scott said. I have Eneloop NMH rechargeables for things like flashlights and the camera flash. I use a good conditioning recharger. It will put the maximum charge in the battery but it’s touchy. If you discharge the battery past a certain point it won’t recognize it as a battery and won’t recharge it. Don’t run them totally dead or you’ll have to get a cheapo $9 charger to pump enough electrons into it for the smart charger to recognize it. LWJ is right they don’t charge up past 1.5 volts and some devices are sensitive to that (like my game camera).
I put alkalines in devices where the draw is low and they stay in the device for months (smoke detectors, electronic door locks).
The game camera shuts down once the alkaline discharges to something like 1.48 volts - lasts about 2 nights and they’re done. The Eneloops last one night, but they can be recharged to live another night, and another, etc.