On Friday, 9 December 2016 11:23:48 UTC, john west wrote:
There's a lot of information about that if you keep a Laptop battery
charged between only 80% full and only 40% full, it will be servicable
over the years for four times as long.

it probbably depends on teh tyep of battery and the make of teh battery and charging circuit, I'm sure Apple used to advise discharging it comnpletely every month adn then charging it to full as this updates the info of teh battery condition so it can fully charge rather than part charge.



Other information I find says it is the charging and discharging that
wears the battery out.

well yes they have a 'life cycle' but I'm not sure with todays battereis whether charging them up every hour to keep them charged is the best option
on to let them go below 10% is best.
Not havign a labtop means I don;lt have to think about it. I charge my iupad when I;m NOT using it and it;s below about 50% charged.
Last night it stopped while I was listening to a podcast 4% was the last I noticed. So at 1:10am I decided I might as well go to bed and charge the ipad ready for the morning.


The laptop i have (with a built in battery) is mainly used in one room,
so it is easy to keep it plugged in *all the time* to mains electricity.

Would it be better to prolong the life of the battery to keep it plugged
in all the time or to go for the 80% - 40% option. Thanks.