On Sun, 19 Sep 2010 11:59:41 -0500, Jim Yanik
wrote:

Joe Schmoe wrote in
:

On Sat, 18 Sep 2010 16:08:13 +0100, Brian Gaff wrote:
I thought batteries used in these packs had to be matched to avoid
problems with reverse charging etc that might cause them to explode.

Hi Brian,

What do you mean by "matched"?

Note: All the existing electronic circuitry for the Lenovo x61 tablet
laptop lithium Ion battery is intact.

The only thing we're changing out is old cells for new cells.

What do you mean by "matching"?



the charge levels and voltage at full charge have to be close to equal.
If one cell is at a lower charge level,it will run out first,then REVERSE
charge,damaging that cell.Possibly shorting,exploding,or starting a fire.

No, that would only apply to packs without a protection module (such
as NiXX chemistries). LiXX protection modules will intervene and
open-circuit the pack when the lowest cell voltage reaches a
predetermined threshold - usually 3v0.