I got a battery for a nokia 3310 to replace the dead one in my 86 year old grandfather's 14 year old phone and he was delighted not to have to go and learn some

I got a battery for a nokia 3310 to replace the dead one in my 86 year old grandfather's 14 year old phone and he was delighted not to have to go and learn something new. He's very mentally agile but he recognises a waste of time when he sees one.