I've heard it said...
I've heard it said, or read about it at some stage, that with these types of batteries, it suits them better if they are charged to a full status (from near empty) each time, instead of keeping them constantly on the end of an electrical connection...
How true or otherwise this information might be, I've no idea, but it's a principle I adhere to with my Acer c720...
I've also found it interesting, that the reference to the charge level (that can be seen bottom right-hand corner of the screen) does vary somewhat in it's estimation of what battery life expectancy remains... I've seen mine at an extraordinary 13.5 hours remaining, when by all accounts, it should only be 8 hours... As for charging, I do that when the remaining percentage rate drops to around 10% ~ or even less...
The other thing I tend not to do, is switch the Chromebook off... The preference being, to simply close the lid so that the next time it's raised, I'm right back where I left off: no matter what I was doing at that time without there having been any loss of 'life expectancy'... Even music (being played on Amazon cloud) has been retained at its previous, symphonic note, which (on a lighter level) proves that time can be made to stand still...
I don't think a day goes by, without I discover another interesting feature (of one description or another) that makes this little machine a purchase that has been more worthwhile, than any other, made in the past several years... Top marks to to Google ~ and the astonishing Chromebook...