[maemo-users] [maemo-users] Re: Two power management settings

From: Larry Battraw lbattraw at gmail.com
Date: Mon Feb 12 04:28:55 EET 2007
On 2/11/07, Neil MacLeod <gmane at nmacleod.com> wrote:
> Neil MacLeod wrote:
> > I also don't think it's possible to overcharge Li-Ion batteries these
> > days (unless they're made by Sony). :)
> >
> Oops, the BP-5L battery in the N800/770 is a Lithium Polymer design - I'm fairly confident these also can't be overcharged but not 100% sure...

  Any battery/cell [1] can be overcharged, particularly Lithiums as
they cannot tolerate overcharge without potentially dire consequences.
 Obviously the cell must be correctly made so it accepts the proper
amount of charge without destroying itself (amid other things), as was
the case with the Sony batteries.  The charger must precisely charge
it to the correct voltage and then completely cease charging;
self-discharge is negligible and there is no need (and no tolerance)
for trickle charging like Nickel-based cells.  So no, it doesn't
trickle charge, and to the best of my knowledge it runs completely off
of AC during charging as well as when the cell is completely charged.
Trying to charge the cell and draw power from it at the same time
would complicate things quite a bit since the voltage would be
fluctuating rapidly as it charged and the device drew power at
different levels.


1. A battery is comprised of more than one cell

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