Charging confusion of Macbook Pro

Question

i'm really confused. and probably, there would be same topics as to this posted many times. my apology for posting this again.
i have read about Macbook Pro batteries from apple.com. i use to talk to many people and ask about batteries which brought me upto this confusion.
well, my question is, should i charge macbook pro when it's battery is completely drained or it's okay to charge at any time as long as it's not at 100%?
for example, i wanna start charging it while its 60% and make it to 100%. is there any problem with it?
one guy came to me and said that, don't charge it until battery reaches to 5 or 10 percent.

Answer 1

Back in the days, older laptops came with Ni-Cad batteries that needed to be fully drained before you charge them back to life to avoid what they call a memory effect - a very long explaination.
Then came NiMh type batteries that are a little better than Ni-Cad batteries and gave you better battery life but you must also charge it when it's almost fully drained.  Still have what they called memory effect - hence the " only charge it when it's close to 10% left.
Lithium Ion came a few years later that performed much better than both previous batteries and are still being used by PC notebooks and some older powerbooks.  But once in a while, you still have to do some battery maintenance to keep it in peak performance.
MB uses Lithium Polymer batteries that last longer and doesn't need as much maintenance as the above 3 batteries.  You can leave it plugged in or you can recharge then anytime you want and not have too much effect on it's performance.
That is the short version of it.
Hope that helps you a bit......