Those old school nokia/blackberries. Nothing beats a phone that could literally go all weekend without charging. A few times I've had a nokia go all week without having to charge it with moderate use.
I do miss it because my options are down to very few. The Moto X, which i'll have to hang onto for years until someone comes out a phone this size, or galaxy mini. And that seriously sucks. Leaves us women especially very few options.