Re: [OT] Bluetooth in car

["davidir" <david@xxxxxxxxxxxxxxxx>]

--- In ukha_d@xxxxxxx, "Phil Harris" <phil@a...> wrote:

> Hmmm ... I'd love to see some proper electrical/chemical/physical
info (that
> I can follow) on this but I've just discovered the demise of the
second
> battery in my Toshiba PDA. The first battery lasted at most about
six months
> being recharged every day (replaced under warranty). The second
battery was
> recharged about ten times before the PDA was pressed into service as
an MP3
> player doing music on hold for someone and spent about a year
sitting on its
> charging base and now lasts about - hmmm - ten minutes before dying
> completely.
>
> Similarly my Compaq Armada (now about 4 years old and used by SWMBO)
has
> pretty much been used plugged in permanently plugged in and is on
its third
> battery (now about two years old) however that battery is kept
tucked away
> in a drawer and the laptop is run without battery on the whole. I
dig the
> battery out every few months, charge it up, run it down and then
charge it
> up again before putting it away in the drawer again and it still
runs the
> lappy for about 3.5 hours (which is about what it did when it was
new).
>

Phil.
I think the point here is that you are allowing the battery to
completely discharge - I am assuming here that it is a Lithium-Ion
battery, and that being the case even with the usage of this machine
you should leave the battery in the machine so it is maintained with
as much charge as possible.
With the PDA you mention I cannot expain this other than to say I have
seen devices where they initiate a charging cycle when connected to
their docking cradle, and then only re-initiate the cycle when the
battery reports as LOW (about 10% remaining charge). Modern laptops
and (I hope) PDAs should be designed with the knowlege that Li-Ion
batteries should not be deep discharged and trickle charge almost
constantly (I think it is about a 15 minute cycle from end of charge
to start of charge in laptops)

Dave