BLF Community Battery Pulls Overview Thread (Laptop packs and Tool Packs)

Are they brand new but unsold packs?

No…all used…just some put back in packaging.

eas - Thanks for your input and tips.

Samsung NC10 6cell (5200mAh) laptop battery (AA-PB8NC6B).

I expected something along the lines of Samsung 26F or so.
But inside were Sanyo UR18650FM N30B, stating so, embossed and as always barely readable, on the translucent red wrapper.

We always knew from the charts of lygte-info and dampfakkus that the Sanyo FM had some advantage over the Samsung 26F, but that Samsung would use them in their own netbooks…

Never saw this translucent wrapper on a Sanyo cell before, but the ring on the plus side is light blue as usual. In addition I’m pretty sure the battery I opened is genuine Samsung. I have 2 NC10 which I had bought new at the time and their batteries are identical to this one, which I had sourced from eBay. Opening was difficult, to say the least. I had to crack the casing but the real pain was the glue-tape inside, which was sticking terribly to everything it was attached. I had to rewrap the cells as some of the wrapping did not survive the disassembly.

The cells were down to 2.4V - 2.6V. I carefully charged them, temperature was not rising. As they held 4.2V pretty good for a day, I made several cycles with low charge and discharge current. They sat for a week and went from 4.21V to 4.18V. That convinced me to use them.

Capacity is between 2200 and 2300 mAh. That’s pretty cool for cells this age (N30B means 2009, week 30). But that’s only for lower current. At 3A voltage sag seems to be higher than it usually already is with these LiCo cells.

anyone have info on lgep218650 cells? think they were in a toshiba laptop. purple wrapper.

LGEP218650
5363100376
DL15404P2

that is what is printed on wrapper on one cell. not sure if the second and 3rd set of numbers are same on all 6 cells or not.

get us a photo of the battery and it would help us out more.

i will see what i can do. i dont have a very good camera

I found this battery pack in the recycle bin yesterday. It seems to be for some sort of portable Hoover vacuum. It was strange to see the old-fashioned Hoover logo on a modern battery pack. It had to be modern, it says Lithiium Life”.

Checking the back of the pack, it claims “20.0V MAX and 72Wh”
The 20V max probably means that it contains 5 cells in series. Most tool packs would call this an 18V pack, although some companies would call it a 20V pack, for example DeWalt.

But a rating of 72Wh means that this pack is rated at 4Ah and multiplying that by the “standard” rating of 18V for this type of pack would give the 72Wh rating. Can’t wait to see what’s inside!

There is a sophisticated BMS board with controller chip and 2 FET’s. I presume 1 FET acts as a switch to shut the pack down when any cell reaches 4.2V during charging, and the other FET acts to switch the pack down when any cell discharges to less than around 2.75V.
Now to see what the cells are!

There they are, this pack contains 10 - Samsung 20Q (20R), 2Ah cells (2000 mAh)! All cells were sitting at around 2.4V when I measured them. First thing I did was trickle charge them all up to 3.0V, It only took a about 10 seconds (a good sign). Now I am in the process of individually charging them up with my OPUS. Each cell-pair (5S2P configuration) so far has soaked up 4000mAh of charge (another good sign). I will report the final results later

I think this pack was a VERY good find, as it likely will yield 10 good Samsung 2000mAh IMR’s

EDIT: May 7, 2015

Turns out this IS a very good find. All 10 cells discharge to over 2100mAh. Most likely the reason this pack was tossed in the first place was because the included BMS board was bad. Even though the cells are good, the pack could not output through the board.
Samsung IMR 20Q’s are rated at 2000mAh, all of these cells test out at slightly over that. So all 10 cells are in “like new” condition.

Pulled these out from a SONY PSVITA 5,000mAh portable charger.

Anyone know what cells are these? they have no marking at all.

Those very much look like Sanyo UR18650ZT's

Hi I extracted some cells from a Dell battery. Pleaseehelp me identify them.

Also from another battery got Samsung 18650 - 26d Sdi cell is it 4.2 or 4.3 volts cell?

Imgur

So is there a trick to getting to rummage around in a recycling bin for these batteries? I have been nearly run out of two Home Depots and Best Buy looked at me like I had a second head growing out of my neck… They even had a “why would you want to drink the toilet water?” look about them when I asked at that Best Buy to look through the recycle container for the batteries. I have been polite and extremely neutral when they say it is “for my safety” that they cannot let me do this, but what kind of techniques have worked for others here?

Do you know someone that works for a company that has an in-house IT department?

That's where I get mine, 40-50 packs per year. We have over 600 employees at my office and zero desktop computers. 70% of them bring them home each night or offsite to clients everyday so lots of wear on the batteries.

That is a good source…Thanks. I do not know anyone off hand that works for a company that has that, but will keep my ears open.

If you are in a high traffic area like a college you can make your own recycling box like they have at the home depots.

Or you could just steal a couple of those cardboard home depot recycling boxes....and recycle them by dropping off a new box (empty) and taking the old box (full) .

" What are you doing ?? "......

"just picking up the recycling ..here's your new box" .:P

if the push you just say green stuff like " Give a hoot ..Don't pollute " or .. quote Al Gore

What type is this battery, from a old Dell laptop (2005). I had two battery packs to the laptop, and the first one was 6 x US18650GR (Sony 2550 mAh). They have been in the Opus BT-C3100 with a charge test (charge - discharge - charge) and at 1A, they gave me a result of around 2500MaH (2480-2540) So it’s seems they work just fine.

The second battery pack had 6 x dark red batteries with a green rim at the top. They are only marked with a large D and then J18A. There are also a serial number on them (was sure that was the name of the battery, but soon discovered that the number was different on every cell.

Just started a charge test with them.

Is this type of batteries worth saving, or are new batteries better?

J18A
JD6FK17
108243

Ha, you got the reference… Nice clip.

I took the advice and found someone that knows an IT guy. First pack was an old dell battery with six Samsung ICR18650-26FU… NICE… All were above 2.2V so I am checking them on the D4 now…

Sincerely appreciate the help, now I have to build an IT guy a flashlight to keep the packs coming…

so if you are in a battery junk yard use this way to find capacity of individual cell without having to google it.

to get a maximum mah rating battery look for a battery bank that has highest wh ratings.

an individual cell having WH rating above 9.5 means it at least is 2500mAH.

i hope somone good at andorid programing would code a little utility for this purpose ... dang i never worked with visual programing. all were console based.

Is this of any help?
http://www.dell.com/downloads/global/corporate/environ/comply/msds_doc_part_num_portables.pdf

I bought a pack on Ebay and tore it down today.

Dell Type 4M529
Rating 11.1v
Capacity 90Wh
Made on 2013/01

9 Samsung ICR18650-28A all had 3.78 volts. :slight_smile: