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Alkaline batteries

I wouldn't recommend alkaline batteries for the F2 because they often leak out corrosive liquids even when their power output is still good. I would recommend 3V lithium batteries, as I have never heard or found them leaked. If you use alkaline or silver oxide batteries, then regularly check they are not leaking or sweating.

Even branded batteries leak

These batteries were still producing 1.477V

and passed the DP-1/11 battery check

Battery liquids seeped into

the battery contact and tag

The battery tag was corroded

and full power could not get to the finder