How To Not Kill Every Rechargeable Battery You Own

It seems like every device we use, from toothbrushes to mobile phones, has some kind of rechargeable battery in it now. I mean, seriously, toothbrushes? Prolonging the battery life means prolonging the useful life of your gadget. Are there things you can do that would wreak havoc with the millions of microscopic hamsters inside the battery that power your laptop? [More]