This is a bit obsure, but someone might know...
Recently I've bought several things: phone, razor, organiser etc. which have rechargable batteries.
In each case, I'm told that I should let the batteries run dry before recharging to extend battery life.
This is impractical, as the power running out at any time could be most inconvenient.
My television manual says that I should unplug it every night, but 10 years on, still works having been plugged in all the time. Is it the same with mobile batteries?