On Fri, 11 Dec 2015 11:13:35 -0500, "Percival P. Cassidy"
wrote:

This battery pack does have connections from every between-cells
connection to the PC board, so I am assuming that this was supposed to
be part of the balancing circuitry.

I wasn't aware of that. Progress lurches forward, usually when I'm
not looking.

This might be of interest if you want to repair your battery pack:
"Cell Re-balance of Ryobi One+ 18V Li-ion Battery (130501002)"
https://www.ifixit.com/Guide/Cell+Re-balance+of+Ryobi+One%2B+18V+Li-ion+Battery+%28130501002%29/13286
"Rebuilding Ryobi 18v Batteries"
http://toolboyworld.com/eBay/Ryobi_Batt_Rebuild.htm
Looks like the balancing circuitry is in the battery pack, not the
charger.

I can buy two of the 4AH packs for $99, so replacing all ten cells (five
*pairs*) in the present one would probably cost about the same for less
capacity as one new one.

http://www.homedepot.com/p/Ryobi-18-Volt-ONE-High-Capacity-LITHIUM-Battery-2-Pack-P122/204321540
I would not trust the battery capacity (ma-hrs) as stated on the
label. However the goood price and less risk of buying these is
probably better than trying to rebuild a pack.


--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558