When should you charge a cellphone's batteries

New batteries should be fully charged before their Reconditioning ensures that the battery meter on a lithium ion cellphone is ...

I've heard drain them 3 times, fully reload them after every time and after that it works best. Someone at a phoneshop once explained it to me why but this was a couple of years ago and I basicly don't remember enough of it to give a solid answer on this one. I guess if you want to make sure you have an answer that's well based on technology nowadays and people that are quilified and have studied this you'd best go to a phonestore or check the phone booklet :) I've had my mobile phone fo 1,5 years and I drained it the first three times, I still can use it like crazy whole day and it will last me till early the same night which is good in my opinion. If I hardly use it off course it will last a lot longer. Hope that helps!