On 12/08/2016 13:24, John Rumm wrote:

Changing the subject, what is it about laptop batteries which mean that
they can hold less and less charge as they are recharged, to the point
where they eventually will not hold any charge and the laptop can only
be used on the mains? I've had this happen to each of my laptops, and
I'm very careful about not leaving it permanently on mains. I try to
charge it in the evening when I'm around to stop charging once it's
100%, rather than leaving it on overnight or for many days without
sometimes running it off battery and then charging from low. Happened
with HP, Acer and Samsung laptops.

Its a feature of the battery technology. So wt will affect any brand of
machine.

Although some machines are cleverer about draining the battery every so
often, which helps.