Why aren't rechargeable batteries recommended for remote controls, radios, and medical or safety devices?
re chargeable batteries have a lower internal resistance. The will discharge themselves when left alone. Alkaline have a high internal resistance and have a longer shelf life.
Alkalines are used when you need a battery to be there after sitting idle.
rechargeables are used when you cycle the device often.
I use rechargeable in all my radio (TRANSCEIVERS) but never in a portable broadcast band radio that I expect to work wen we have bad weather. I use rechargeables in my remote control toys because they produce more current over a longer period of time, but never in a TV type remote.
Rechargeable batteries should be fine for remotes and radios. Medical, safety devices, and smoke detectors should have new alkaline batteries because you want dependable batteries in devices that could save your life.
Generally they do not have as long of a lifespan as the Duracell and other alkaline the Rechargeable also have a short shelf life after they are charged. This would make them unreliable in emergency or operation that requires reliability.