Got my order today. So delivery was fast. Having a heck of a time opening up the pack that Dchomak purchased. I can see color of cells. Appears to be Samsungs.
The 12 pack is a genuine Toshibia OE pack. Was in factory sealed box (had tamper proof label that had to be cut to open box). I'm not familiar with the cells. Each cell is labeled "SF US18650GR" and "T 6B116MG15K". Each cell is at 3.75 volts. First pack I ever opened with all cells the same voltage.
EDIT: Based on this thread, it's a Sony. I haven't found any date codes on the cells.
Wow, 12 cells for $12.99 is only $1.08 per cell. DBCstm mentioned that kind of price earlier. You say they all measured 3.75 volts. Are you sure you didn’t mean 2.75? If they were 3.75, I would have to think that pack has not been sitting on a shelf that long. I may have to order one of those now.
My second 6 cell pack came in and it too is great. And now for the second time, that deal has been re-listed, but still at the same price of $9.99. Still shows the same “only 3 available” even though many more than 3 sell.
Yeah, 3.75 volts. Near perfect voltage for storage. I was surprised by that too. I have the cells resting right now to see if any will drop in voltage. I will then start charging and check the capacity of a few.
Thank you for the info Jaidmaster. If I'm counting right, these cells were made on July 15, 2005. Seems quite possible as I would expect these batteries to be from old discontinued laptops. How my pack kept a voltage of 3.75 is something I would really like to know.
It's going to be interesting to see how they perform. If past history repeats, I expect that they will perform close to like new.
3.75V is right in the recommended long term storage range, and should equate to somewhere around 40% of it’s full capacity. The capacity loss at that voltage is very low… I’m no expert, but do recall seeing a table on li-ion capacity loss over time, and it starts out like a few % for the first month and drops from there. Does not seem unusual to me, and probably have some pretty good cells. If it was not charged to 100% before being packaged, even better.
I think I have somewhere around 80 or so laptop pulls - it’s quite fun. And then finding the best ones for various purposes.
Good luck!
Man this is tempting. Buy one of these packs for using the cells in my ENB power bank and toss my well used laptop pulls! Question: what about this 9 cell pack for $12.99? Any thoughts on if this 9 cell pack will have similar capacity cells to the 6 cell one? I can't seem to find any capacity info for that 9 cell battery.
The info I could find on this pack puts it at a 83Wh, 10.8V pack. This would indicate a 3x3 config, so probably 2600mah cells… 83/10.8 = 7690mah/3 = 2562mah cells…
Pack info from here:
Ah, thanks! This is tempting, but I just keep spending too much money. Hard to pass up though. Guess the issue with the 9 cell is that we don't know what cells are inside and we expect the Samsung 26F's 26C's in the 6 cell. Wonder what the chance is that the same Samsung cells are in the 6 cell.
DCH - how hard was it to disassemble that 6 cell battery pack?
I once got a lot of about 8 packs all the same part number and got Sony, Samsung, Sanyo and LG cells from them. Mostly LG and Samsung. One pack each of the Sanyo and Sony.
Edit: They were Dell PC764 6 cell packs…
I got it open easily enough using a 1” wood chisel, the sharp bevel edge inserts easily into the crack, the 1” width gives good leverage for a twist action to pry the seam apart. Not a problem took myabe 5-10 minutes and all the cells were out and separated.
Used a cut-off wheel on the dremel to touch the weld spots and get a smooth surface, kind of like surgery that was.
3 pairs, 2 were at 2.69V, 2 at 2.59V and 2 were at 2.42V. They all charged up well and are holding that 4.19V.
My Solarforce M8 pulls 6.77A through a pair of Samsung 20R’s (MT-G2)
It pulls 5.25A through the Sony UR18650FJ lap pull
These allow 5.75A, so they’re better than the Sony but less than the 20R. Nice compromise, 2600mAh is a good capacity. Happy happy happy!
Garry, my six pack is being a bear to open. It's like continuously welded/glued along the seams. I'm actually carefully biting off bits of the case using needle-nose pliers. I've opened up more than my fair share of packs and this one beats the bunch by far.
1” wood chisel? What a good idea DBCstm. I have a real nice set of wood chisels, but never thought to use them for that. I will try that tonight on the remainder of the pack. Thanks for the tip.
Did my first pull yesterday, it was an old, around 10 years, Acer battery pack, had 8x18650, all of them, except 3, reads 0V, other two are around 0.05V and sagging while on multimeter and third one shower negative –0.15V and sagging :D?!
Anyway, I suppose I have to get rid of them?
Im on my way to this shopping mall where they have recycling booth for electronics etc, will toss them there.
EDIT: Cells are labeled as hkifht5, have F at the negative end. Google gives nothing in return.