Hi Folks,
Yesterday I observed something which surprised me (running
Debian Etch in VirtualBox in Win XP on an Advent 8117 laptop).
WHen I sat down at the desk, I noticed the battery-charging
LED flashing. When I check the battery level monitor (in both
Debian and XP) it was at 20% and charging. An hour later it
was fully charged.
I generally leave the laptop running continuously, days on end,
and its power supply is permanently connected to the mains.
It's possible that something disturbed to connection for a
while (perhaps most likely where the mains cable connects to
the PS brick), and that something later re-established it
(I do tend to swim in a pile of clutter so stuff gets pushed
around), but the event prompted me to wonder the following.
Might it be that, if a laptop (at any rate for some models)
is kept continuously connected to the mains for days on end,
then for the sake of battery health a re-charge cycle is
initiated, whereby the input from the mains-connected PS brick
is internally disconnected for a while, until battery-level
drops to a fairly low level, and is then re-connected?
It is, of course, known that it's good for battery life to
submit it to a discharge/recharge cycle every so often; but
I've not heard of this being built-in to laptops' power
monitoring. (But then there's a lot of stuff I haven't heard of).
Ted.
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E-Mail: (Ted Harding) <Ted.Harding(a)manchester.ac.uk>
Fax-to-email: +44 (0)870 094 0861
Date: 22-Feb-09 Time: 09:44:56
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