[PLUG] Rebuilding laptop battery packs

[Rigel Hope]

i have heard (but cannot confirm) that the spot-welder part of things can
be a bit tenuous. especially since li-ion cells have a predilection for
"rapid venting with flame"

I also seem to recall something about inter-cell variation and charge
balancing that's impractical for the home tinkerer but the details escape
me. there's probably a more detailed pro/con/howto on candlepowerforums,
the probable source of my hearsay.

regardless, I'd be interested in the outcome.
On Dec 29, 2014 6:47 PM, "Larry T" <holgate17 at gmail.com> wrote:

> Always interested in different things, and this sounds different.   I may
> be able to borrow a styrofoam knife for a trial run, I'll check tomorrow.
>
> Larry T
>
> On Mon, Dec 29, 2014 at 5:58 PM, Keith Lofstrom <keithl at gate.kl-ic.com>
> wrote:
>
> > I have accumulated a bunch of old Lenovo T60 laptop battery
> > packs that don't hold a charge.  Lifting the label - the
> > cells are standard, perhaps replaceable by new ones.
> >
> > Anybody interested in rebuilding battery packs?
> >
> > My packs are glued or plastic-welded together, so I would need a
> > hot knife to open them, appropriate adhesive to put them together
> > again, a small spot welder to tab the batteries, and presumably
> > a ventilated space to work, in case a cell catches fire.
> >
> > With enough participants we could buy the right tools and buy
> > cells in bulk.  Not sure how many types we would need. My T60s
> > and X60s both use CG18650 cells, which are $39 for 12 Panasonic
> > cells on eBay, $499 for 360 cells.  Chinese cells might be
> > cheaper (both ways).
> >
> > This cell size is often used for "vaping"; does that push price
> > up or down, or merely attract dangerous counterfeits?
> >
> > Keith
> >
> > --
> > Keith Lofstrom          keithl at keithl.com
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> >
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