|Hi Mark, |
above advice is good, however with these coin cells often being only for 3 volts it is difficult to be precise when to discard.
e.g. a new 3v battery might show 3.3 v, whereas a used one 3.1v. I have experienced a car remote key would not work with the used one installed, but fine with the new one.
Am surprised at the price you quote, although you have not advised for which battery. For example, here in the UK, a blister pack containing 8 mixed (CR2016, CR2032 etc.) batteries costs £1.
As a matter of interest, where are you based? I am in Hammersmith, West London.
Good Luck - Keep us posted.