If the batteries in your metal detector have been discharged and the device refuses to work, a simple flashlight will get several hours of useful life out of these ones – checked on the Garrett ACE 250, Garrett AT PRO and Minelab X-Terra 705.
I’ve provided myself with a box to collect batteries that aren’t already working in the detector. I’ve also bought the simplest flashlights with 1 AA battery – a few of them. And uplighting in my life is for free ))
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The same goes for AA rechargeable batteries. They should be discharged before recharging anyway. After being used in the metal detector, each rechargeable battery has enough power remaining for 3 or 4 hours of flashlight use.