Bernd Fröhlich <
be...@eaglesoft.de> wrote:
> Your Name <Your...@YourISP.com> wrote:
>
> > BUT leaving your portable device plugged into the wall constantly is
> > not a good idea either (even ignoring the fact that it was pointless
> > buying a portable device in the first place).
>
> I beg to differ.
> My MBP is almost constantly plugged in and hooked up to a Monitor.
> About once or twice a month I take it with me.
That sort of usage pattern is fine.
Problems can start to occur if the battery is not exercised for several
months to years. I've seen a few cases where someone had a MacBook that
almost never got unplugged from power, and they were surprised to find
that the battery didn't hold much charge when they came to try using it
after a year or two.
Using the computer on battery once or twice a month should be enough to
keep it healthy (running to empty would probably be better, but even
some battery usage is better than none).
> Worked fine for several years and still held enough charge to last a
> working day when I got a new one last year.
> I´m pretty confident this will last about 5 years before I buy the next
> one. (And if not I´ll simply have the battery replaced by Apple.)
>
> I just don´t have the time to pamper my battery and try to "optimize" it
> by letting it run empty every other day or by any other means that
> supposedly prolong it´s lifetime.
Running empty every other day would be excessive. Apple recommends
letting it run empty every month, and that's mostly to calibrate the
battery level measurement. I don't bother, nor do I know anyone who
does.
My typical usage pattern is to have the computer plugged in on weekdays
while at work, and if I use it at home or elsewhere in the evening or
weekend, it is mostly running from battery, except where I have used it
enough to need to plug it in, or if I'm doing something more intensive
that justifies working at a desk or table.
I had each of my previous two MacBook Pros for three to four years and
they still had several hours of operating time on the original battery
when I sold them (both to people I know, so I've had occasional updates
about their current state).
The older one had a removable battery, rated for 80% of its original
capacity after 300 charge cycles. It was up to 450 charge cycles when it
was approaching three years old, and I didn't notice much drop in
battery operating time. The new owner never replaced the battery and it
was still good enough to be useful after seven years. Unfortunately the
computer suffered an accident about then so the experiment can't
continue.
The newer one had an integrated battery, rated for 80% of its original
capacity after 1000 charge cycles. I didn't note where it was when I
sold it, but a sample at about the two year mark shows I was using about
150 charge cycles per annum, so it was probably around 600 when I sold
it after almost four years. The new owner now has it plugged in all of
the time, which is probably not good for it.
I seem to be using the battery a little less on my current MacBook Pro:
about 110 charge cycles per annum so far. The battery operating time is
longer on this model, so it may be that I'm using it on battery about
the same amount but that isn't discharging the battery as far as with my
previous one.
--
David Empson
dem...@actrix.gen.nz