Macbook nonremovable Battery and battery wear

I am looking into getting one of the new macbook pro's. Though I must say the non removable battery does concern me a bit. In past laptops I have had, I without a doubt saw increased battery wear and tear when I left the batter in the laptop while the laptop itself was plugged in. I completly destroyed a battery on my Dell laptop by doing this for about a month when it was asking as a desktop. I took the laptop which used to get around 4 hrs of battery life and then after a month it got no more than 15 minutes.

So after that I always took the battery out, so now with the new macbook pro's you cannot take the batteries out, so wont the batteries wear down to nothing faster than if you took them out when not using them?

 

nope... its smart enough not to cause that kind of problem

 

is the so called smarts built into the hardware or the OSX OS.

 

Um... what did you do to those batteries? Did you dip them in salt water or something.

All laptops manufactured within recent times (more than 5 years ago) is smart enough to stop charging the battery when it's full.

The "smart" circuit is built into the EC inside the laptop battery and has nothing to do with the operating system.

 

I didn't do a thing to them, they just killed themselves after a while.

 

It's possible to get a bad battery, it happens. With regard to overcharging, the battery has a circuit which tells the computer it's full and to stop charging. By the way, there's a firmware update that is supposed to help extend battery life by reducing it's charge "leakage". I applied it and it works. Now it only charges ever week or two, instead of every few days. I use my macbook as a desktop, so it's always on AC power, and every few days the charge would be back down to 95% and start charging again. Now, it dwindles much slower.

 

I just trusted that Apple is right when claiming a 5 year battery life, and got the 3 year extended warranty so I can go back and complain if I have to.

Currently have 71 cycles and 95% health, so this is way better than what I used to get on the old MacBook Pro. I am really an abuser of batteries - I managed to kill the battery before the 1 year warranty was over for my last 4 or 5 laptops. This one's looking good so far, I think it will last the claimed 1000 cycles, which for me is about 3 years.

This on a 17" unibody MBP.

 

Oh yes, one observation: When the battery lasts longer, e.g. 7 hours, I get fewer full charge/discharge cycles. With the old MBP (3 hour battery life) I had 1 or 2 cycles / day, now it's less than 1.