Quote:
Originally Posted by OzStarGazer
I will also buy some alfoil today
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You don't need to buy a whole roll (unless you need it for the kitchen anyway) - the foil wrapper from a chocolate bar or stick of gum will work just as well!
Just get a piece of foil about 4 cm square, and fold it over itself a few times to make a little "slab" about 1 cm to a side by a mm or so thick. Slide this between the button battery and the spring terminal, and it should apply enough pressure to maintain a good contact.