I seem to be the only person never to have owned a laptop - but that's about to change! I anticipate mostly using it around the house, so will usually have access to mains power. So do I run it off mains power, or use the battery, or a bit of both? Old answers to this question mention removing the battery - but someone mentioned to me that the latest laptops don't have removeable batteries - is that correct? Also, there seem to be differing views on when to charge lithium ion batteries to ensure the longest possible life - the guy in PC World (very helpful, but possibly biased and/or not very knowledgeable?) said to run them down to 20% and then charge back up to 80% - views on that would be welcomed. As a parting shot, the same guy also said that li-on batteries have a fairly long life nowadays, and I'd probably get sick of the laptop and change it before I needed a new battery - he didn't know I'm far too mean (and non-techy) to buy a new one until the old one explodes in my face!!