Has anyone found a replacement yet? I have the same sight - and the same problem. It may be a 1/3 AAA battery in size, but the voltage is wrong. Mine isn't completely dead (still lights the LED a bit), and it reads 3.6 volts. A fresh replacement should be higher of course, so maybe 4.8 volts (4x 1.2v silver oxide) or perhaps 4.5 volts (3x 1.5v alkaline or lithium?)
In a pinch I think 3 LR44 button cells might work, but if you try this, make sure you tape them up so they are insulated from the tube they fit into. (If you just put the 3 bare cells into the metal tube you will get only 1.2 volts and the other two cells will be shorted out.)
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