Probably the same source as rhino ... guy, got 13 NOS - returns(?), 12packs of cells.
Opened 12 and got 6 SONY and 6 Sanyo, kept 1 in case I ever got the same laptop.
Bulk charged them all then rigged in series for a discharge capacity test.
One brand at a time, I rigged as 18s4p and discharged through a Volt, Amp, Watt, mAh meter.
This allowed me to vary discharge, started with a 100w bulb and a 150w small heater.
(Yes, many 120V AC devices run OK at a reduced DC voltage)
With the mAh meter, powered by secondary battery, it is possible to remove cells as they near "empty" (3.60V?).
Just mark mAh on cells, as removed.
Ran SONY in one batch - all very close in capacity
and SANYO in second batch - 3 12 packs identical , 2 slightly less and 1 slightly more.
Perfect!
9 banks of 8 Sony + 4 Sanyo = 9s12p 33.3V 31.2Ah pack ... that fits in the eZip OEM pack.
If I remember correctly about $90 for a 1kWh battery!
Tested another batch at 20s2p that weren't of near equal capacity so required closer monitoring and frequent cell removal.
Cells charged in parallel (1s40p) to insure identical starting voltage.
(Held together with 8mm magnet discs)
$12 V-A-W-Ah meter had a 90V rating, so I limited to 20s ~84V.
See -
Bulk Capacity Testing
Tip: put laptop packs in freezer.
When cold, heavily tap on seam to crack open plastic cases, very small hammer, etc., I have used a 3/4" wrench or large-heavy screwdriver handle with good success.
Let warm to room temperature before charging!