That battery is for, among others, the Libretto U100/U105 laptops, which were from, apparently, the 2005 timeframe, see:
So, these could be/probably are leftovers “new” packs that the seller are trying to get rid of.
As discussed elsewhere, it appears that if the pack is really new, e.g., in this older thread:
Pulls from a “new” pack come out a little low (in that case, the ones I got all came out of the pack at ~1.9V.
Nice find Gj, I have a couple of lights that I use this size cell in. Just picked up one of these, will give harvesting a go;)
How would a seller test them? All I can think of is to charge them. Then they're not new anymore, right? Or I misunderstood what I read in other threads.
These drop right into those free Harbor Freight flashlights and work fine without an adapter, should need recharging every year or so. 
The cells look identical to the ones in your picture. 2 were at 2.23, 2 at 2.35 and 2 were at 2.02. 4 are in my SoShine Max 3 4 bay charger as I write this. The lower 4.
Battery case opened up really easy, tape came off clean, even the tabs were not too difficult to remove. Nice find! Nice price! Thanks for sharing this!
As far as buying these so cheap goes, with laptops getting outdated every year or so, these are almost assuredly old stock that the laptop they were designed for is not longer in production. So they are just recovering some losses. Makes sense to me, at any rate, to get Japanese cells for $1.50 ea works for me!
Thanks again, really appreciate it!
I just noticed this thread for the first time. Thank for finding and sharing this Gj. I bought 2 packs.
My first 4 are up to 3.94V in the SoShine S1 Max V3. I’m thinking they will work nicely in any of my single 18650 lights with a short spacer. 
Almost free, considering. I have a single AW 18650 Protected that’s 3400mAh that cost over $20 by itself!
With a couple of smaller lights that actually used to use the 3AAA adapter, this works well and I plan to put them to good use. Now if I could just round up all those lights…
Thanks for the report DBCstm. Please keep us updated.
One of the lights I plan on using these cells in is my Rook. I get tired of fiddling with the 14500's and these are close to the capacity of 3 of 14500's. Plus, I have other lights the 14500's can go in.
3 at 4.21V 1 at 4.20V, put the last 2 on just now. I have no idea how to compute any of that, but it took 2 hours and 17 minutes at 1A charge rate.
In my modded M3, an Efest IMR18650 2200mA cell will allow 4.28A. One of these charged up will allow 4.13A. Not bad!
I received 2 more today. I don't recall even seeing new 1700mAH 18500's for sale anywhere, usually 800mAH off-brands. This seller ships fast. 
Has anyone tried adding a protection circuit to cells? I see FastTech has them. I'd feel more comfortable with protected cells in my 4 cell UV light.
That's an interesting mod. How are you going to bore it out? Will you need contact plates at both ends?
Not sure how it should be bored out. I think I better ask some gurus for advice on that. I'm guessing a drill at high speed in a drill press and moving slow. Not much material needs to be removed. So I could just use a curved file if I had too. The driver takes positive in the center pad. So no mod needed on the driver side. Probably just drop a floatng plate in the bottom on top of the springs so that I can remove it to use 14500's.
Any one figure out the date code on your cells yet? I wouldn't be surprised if they are fairly old, but one can hope they are not.
Mine are sitting at 4) 4.19V 2) 4.20V after some 9 hours of rest time. So they seem to be fine.
I just cracked mine right now, all 12 of them are identical to the Sanyo 1620mah 18500 I bought on fasttech for $11 for 2. IMO I have no doubt they’re Sanyo, wish I could buy more but just have too much already. This is a great bargain! Thanks for sharing again GJ
Great news. This is sounding like a real winner of a deal.
Kind of funny, but not really. I figured if this place had such a good deal on an older style laptop battery then I’d give em a shot at the battery in my old laptop. I have a quite old Sony Vaio that I cannot get rid of because it is the only computer that will sync to my older Pro Canon Camera, which is the only way to change some of the settings in that camera.
They have the battery pack, a very small pack by most of todays standards. It’s $44.95 and 39.99 shipping! 
Haven't found any info on the date code yet.
They should have left that whole space open and slightly deeper, with a variety of carriers it would have been as versatile as the SD10.
Awesome. I didn't realize it, but my laptop batteries showed up yesterday. Quickly broke down a pack and have 2 on the charger now. I see not date code imprints on the cells. The batteries was packaged in what appear to be the original manufactures box and packing. There is probably a battery pack date code somewhere in this:
Repair Parts
Stock No: P00043574028095146
Description: Battery Pack G71C00054210
101 1A3C3401 - 0001
Bar Codes:
*G71C00054210*
*28095146*
*P000435740*
I will do discharge tests on one or two cells today. The cells arrived with voltages ranging from 1.8+ to 2.2+ volts. The two on the charger now are staying cool.
All my triple AAA lights are getting those cheesy battery carriers thrown into the battery drawer. Since each one of these cells is about equal to 3 AAA's, I now need 36 less Eneloops (I bought 2 laptop packs). Now I don't have to avoid 3AAA lights that are too short for 18650's anymore.
I haven't found a plastic adapter yet that works with these. So I'm going old school for now:
That’s one of the Defiant 3xAAs, right?
What are you using to wrap the batteries (can’t tell)?
For 18500s, I’ve been using these, cut in half (so I get two 18500 wrappers for each one of these):
Yes, you are spot on. No, the Defiant 3 AAA two packs. I know you can mod these Defiants to squeeze a 18650 cell, but I would like to not go through that and also keep the AAA compatibility. The adapter above is from the cardboard tube from a paper towel roll.
Thanks Ohaya for the link to that adapter. Looks good. Are they snug fits or is there some play?
EDIT: Edited first sentence. Just noticed you said AA, not AAA.