Is it true that if I recharge my laptop battery when lets say it's 70% full I shorten the life of the battery? Because I've heard u should only recharge on a completly depleted battery. Is this true?

I don't know a lot about laptop batteries, however, I do know a bit about batteries in general. What happens, is if you recharge a battery when it's half charged, or not completely depleted, it develops a 'memory'. What this means, is that it will only charge to a certain level (less than 100%) and the more you do it, the shorter that memory gets, and eventually the battery becomes useless. However, from my experience with laptops, whenever you plug them into the wall, whether you are using it or not, they charge. It seems to me that the laptop makers would see that not everyone constantly waits for their battery to 'die' before using it on a/c power, and therefore would use a battery that does not develop a 'memory'. There HAS to be some reason that a laptop battery can be $80! I know that doesn't answer your question at all, but it's my 2 cents on the matter, for what it's worth. -Mike

It depends on the battery type. A NiCd, Nickel Cadnium, battery has this "memory" problem. Newer laptops should have Lithium- Ion or Nickel Metal Hydroxide (NiMH) batteries which do not have this "memory" problem. You will have to look at your battery to see what type you have, as it is normally printed somewhere on the battery casing. Good Luck.