light on a tester screwdriver from light earth wire

[bernardgreen]

Some batteries do indeed have a tester,

www.youtube.com/watch?v=k6Gz5Gom5NI

As they are a thermal process they probably use a fair ( or unfair ) amount of energy which might shorten the battery life a little bit.

 

[ban-all-sheds]

Yes, some do.

Very few.

Duracell are the only ones I've ever encountered.

 

[mattylad]

Giving me a link to a google search is offensive,that user will be removed from this forum.

Ha! good luck with that - the rest of the forum have been trying for years without success

google links are not offensive, they are informative & BAS is not going to know that you already know how to use google when he can see you do not know how to do what your asking about, you might as well just let his comments wash over (which your doing quite well at ).