Not a typical Battery Question

I have seen and heard that leaving your notebook plugged in will kill the battery, which is true in most cases.

but my brother who owns a macbook states that macbooks use a technology where once it is at 100%, it will no longer use the battery thus preventing drainage and it run off the power not the battery.

i am wondering if this is true (he leaves his plugged in and it still last hours)

and how can i be sure my notebook does this? i own a Toshiba Satellite L305D

PS: my battery is not hot whether lone warm when i remove it after usage.

thoughts on this?

all replies appreciated

 

Pretty much all laptops made anytime this century only charge the battery as necessary, not continously. Newer laptops have better technology that will leave the battery floating until it drops a few percent from self discharge before recharging as constant discharge and small recharges aren't good for them. That said my now 5-6 year old at least ZE4145 still has at least a usable battery and it spent nearly its entire life plugged in.

 

thanks,

/thread