MacBook Pro constantly on AC power

I intend to get a macbook pro 13" and plug it to A/C source 90% of the time. I thought such behavior would normally shorten the battery life significantly due to overcharging. The sales person told me that the battery won't be affected in such manner since once the battery is fully charged, the computer will then tap power solely from the AC source only. However I couldn't find any official information from Apple that verify this claim.
does anyone out there has any information regarding my concern?
Thanks

Well, I'm really happy to hear that, guys. I used my Toshiba laptop like that and its battery died pretty quickly. After having it replaced, I had to use it only for travelling, disconnecting it every time when running on AC power. That's why it bothered me a lot that MacBooks Pro had no way to disconnect the battery. So that's really very smart of Apple to prevent short cycles by never starting the charge at >95% of battery power remaining... Please correct me if I'm wrong but that means my battery's gonna be ok if I use my MacBook on AC power every evening (4-5 hours) and discharge the battery twice a week to keep its ions running! But there's one thing though. The laptop gets pretty hot on AC power, wouldn't that damage the battery? Or Apple has already taken care of everything and I really have nothing to worry about? Sorry or dumb questions, that's my first macbook

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