> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
Behalf
> Of Michael Watterson
> Sent: 08 January 2011 08:59
> To: Microcontroller discussion list - Public.
> Subject: Re: [TECH] I am looking for quality 18650 LION battery
>=20
> On 08/01/2011 00:30, YES NOPE9 wrote:
> > I am refurbishing my 450ROG Gateway laptop battery pack.
> > It requires #18650 LION batteries and I would like to pay
> > a low price while avoiding crappy , counterfeit batteries.
> > Any suggestions ?
> >
> > Gus in Denver    99gus
> And the battery pack works if you swap in new batteries?
> Most don't
> Most you need to reprogram the controller/reset memory.
>=20

FWIW I have rebuilt a number of Dell packs with defective cells (I
obtained a pile of dead batteries from our IT dept. and most only had a
single pair of dead cells) and not had too many problems with resetting
the controller provided I manually charged the cells first (I use a
universal RC Hobby charger).  After replacement I find the first couple
of battery cycles in the notebook give very poor life, but it quickly
gets better as the battery controller learns the new capacity.

Sometimes you simply find the cells are badly imbalanced, and manually
charging them all to the same terminal voltage (whilst they are still in
the pack and connected to the protection circuit) will restore pretty
much full capacity after a few battery charge/discharge cycles.  My own
Dell notebook went from ~1/2hour to 3 1/2 hour life after balancing the
cells.

Regards

Mike

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