The battery IS replaceable, just not as easily as most would consider "replaceable". I believe a more experienced member here said it was easy to do yourself but until someone makes a thread/tutorial of how to do it, you may want to pay to have it done.
That being said, your laptop should have come with a 1 year warranty so nothing to worry about for a while. Keep it plugged in as often as possible(once at 100% it runs completely off AC power, not battery, and won't charge the battery until it gets down to 95%). Try to run it down to 10% then charge it atleast one every couple weeks and it should last for a long time. I am not familiar with these newer batteries, but (knock on wood)Im hoping to get at least 3 years out of mine.
By the time you need a battery, I'm sure someone will have posted a walk through on how to replace the battery yourself....
Does anyone have a realistic battery lifespan estimate?
Here is the closest thing we have to a do it yourself thread as of now.....hopefully Kane will be kind enough to put one together for us.
https://rog.asus.com/forum/showthread.php?53152-G751-non-replacable-battery-discussion/page2&highlig...