how annoying when the constituents of lithium batteries are supposed to be such a threat to the environment that when you want a low cost one to run a not important device ie: a calculator you only want one but have to buy at £1 a pack of 30 the rest being useless for me
cheapo batteries in packs from pound shop, you will find half dont work or have a very short charge left, iv tested packs out with a multimeter, its the same with watch batteries.
that depends on a variety of things but the ones i get last not as long as say a duracell one obviously but at a cost of 3p per battery as opposed to £2.50 per battery i'll change them every two years thanks