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

374 posts / 0 new
Last post
xjsnake
xjsnake's picture
Offline
Last seen: 2 months 6 days ago
Joined: 11/24/2014 - 13:59
Posts: 181
Location: Tennessee

downlinx wrote:
xjsnake wrote:
Tore apart my old Gateway battery that I have replaced. The nonfunctional SQU-715 yielded 6 Blue LG 18650 cells labeled LGD5318650.

Right out of the pack each cell tested at over 4v and have taken a full charge from my OmniDok.

I don’t have a way to test the capacity of each cell, nor do I currently have a way to test them. I’ll edit it when I get my Opus in and can do a capacity test.


any more specs on the laptop battery?

Well 6 cells in 2 rows of 3. The battery was rated 4400mAh. So I’d suspect these are 2200mAh cells.

downlinx
downlinx's picture
Offline
Last seen: 3 months 3 weeks ago
Joined: 04/09/2014 - 09:38
Posts: 1292
Location: Indiana, USA

xjsnake wrote:
downlinx wrote:
xjsnake wrote:
Tore apart my old Gateway battery that I have replaced. The nonfunctional SQU-715 yielded 6 Blue LG 18650 cells labeled LGD5318650.

Right out of the pack each cell tested at over 4v and have taken a full charge from my OmniDok.

I don’t have a way to test the capacity of each cell, nor do I currently have a way to test them. I’ll edit it when I get my Opus in and can do a capacity test.


any more specs on the laptop battery?

Well 6 cells in 2 rows of 3. The battery was rated 4400mAh. So I’d suspect these are 2200mAh cells.


thank you, i will get the OP updated asap

BLF Community Battery Pull Thread http://budgetlightforum.com/node/32720

Suncoaster
Suncoaster's picture
Offline
Last seen: 1 month 2 weeks ago
Joined: 02/22/2012 - 07:14
Posts: 2174
Location: Where the girls are green and the grass is pretty.

eas wrote:

Concerned that I might have been breaking an internal weld when tearing the nickle strips free at the negative end,

I think I may have done this, one of these measured 0 amps.
I usually peel the strips off with needlenose pliers, like opening a sardine can.
Next time I’ll be more delicate.

.

"In the land of the blond the one eyed man is king."

*This message is protected with ROT26 encryption.Old Lumens

eas
eas's picture
Offline
Last seen: 2 months 4 weeks ago
Joined: 07/14/2014 - 18:53
Posts: 1354
Location: PNW
Suncoaster wrote:
eas wrote:
Concerned that I might have been breaking an internal weld when tearing the nickle strips free at the negative end,
I think I may have done this, one of these measured 0 amps. I usually peel the strips off with needlenose pliers, like opening a sardine can. Next time I’ll be more delicate. .

I can’t say whether or not that is likely to damage the cells, but after taking more care in tearing apart more packs, I’m certain that, at least in the Dell packs with LG and Samsung cells assembled in China by SMP, there is some other reason for the dead cells, because I’ve had multiple such packs with dead cells in parallel with non-dead cells where I’ve measured the cell voltage before tearing off the strip on the nickel end.

At this point, I’m really down on Dell packs, at least the 4+ year old ones. The ones assembled in China have been mostly dead cells, and even the Sanyo assembled packs with Sanyo cells seem below par and have weird design decisions that seem at risk of subjecting parallel cells to different electrical conditions (I may be grasping at straws here for reasons to explain uneven wear).

.

Jubeldum
Jubeldum's picture
Offline
Last seen: 3 years 4 months ago
Joined: 11/02/2014 - 09:20
Posts: 2057
Location: Michigan

Just tore apart (peeled the sticker off and the whole case separated) a Dell Latitude P/N 3149C Made in Japan.
14.4V 3000 mAh 8 cells. All had over 3 volts.
Sony Energytec STG US18650S H2

Are these the ones that used to catch fire?

Jubeldum
Jubeldum's picture
Offline
Last seen: 3 years 4 months ago
Joined: 11/02/2014 - 09:20
Posts: 2057
Location: Michigan

UN 356S1-S1 Laptop Battery Pack.
Rating: 11.1 Vdc
6000 mAh

9 Light Blue Samsung ICR 18650-20 all at 3.72 volts.

downlinx
downlinx's picture
Offline
Last seen: 3 months 3 weeks ago
Joined: 04/09/2014 - 09:38
Posts: 1292
Location: Indiana, USA

Jubeldum wrote:
UN 356S1-S1 Laptop Battery Pack.
Rating: 11.1 Vdc
6000 mAh

9 Light Blue Samsung ICR 18650-20 all at 3.72 volts.


was this for an advent or vega product?

BLF Community Battery Pull Thread http://budgetlightforum.com/node/32720

kaiser
Offline
Last seen: 3 years 6 months ago
Joined: 03/26/2014 - 15:48
Posts: 87
Location: 55° 43' 32.6", 24° 21' 59.65"

Took apart a Dell Inspiron battery pack – J1KND (11.1V; 4400mah; 48Wh). This one was a lot harder to open than my first HP battery pack.
LG LGDAS31865 2200mAH (10A ?) 3.7v cells inside.




Edit: all 6 cells measured ~3,9V. So not bad I guess.

Coming back to my previous pull. 3 cells measured 2V, other 3 – 2.65V. Some guys say that it’s only safe to charge cells that are at least 3V when pulled. How much truth is there? Still waiting for TP4056 charging board I’ve ordered earlier so wasn’t able to try myself. But maybe I shouldn’t if it’s unsafe?

Jubeldum
Jubeldum's picture
Offline
Last seen: 3 years 4 months ago
Joined: 11/02/2014 - 09:20
Posts: 2057
Location: Michigan

downlinx wrote:
Jubeldum wrote:
UN 356S1-S1 Laptop Battery Pack.
Rating: 11.1 Vdc
6000 mAh

9 Light Blue Samsung ICR 18650-20 all at 3.72 volts.


was this for an advent or vega product?

It was like a no name laptop that I trashed. I just made sure that I got the pack model #.

Otanacious
Otanacious's picture
Offline
Last seen: 7 months 4 days ago
Joined: 08/07/2014 - 00:43
Posts: 582
Location: San Jose, CA

kaiser wrote:
Coming back to my previous pull. 3 cells measured 2V, other 3 - 2.65V. Some guys say that it's only safe to charge cells that are at least 3V whem pulled. How much truth is there? Still waiting for TP4056 charging board I've ordered earlier so wasn't able to try myself. But maybe I shouldn't if it's unsafe?

eas has an extensive article on his site explaining how determining cell health from a voltage screening off the pull is can be moot. <2.7V is still caution territory I reckon, but with quality brands like the LGs you pulled may be able to get away with it. Cells manufactured in China like Lishen or EPT may not be so hopeful; just watch carefully for a few red flag observations like heat during charging.

Best way to assess cell health I suppose is to run them through an analyzing charger of some sort. 

eas
eas's picture
Offline
Last seen: 2 months 4 weeks ago
Joined: 07/14/2014 - 18:53
Posts: 1354
Location: PNW

Thanks for the link, Otanacious.

My current POV is that, indeed, cell voltage from a laptop pull is of limited utility as a screening criteria. There are too many factors that go into it.

Below a certain threshold though, cells from laptop pulls should definitely be pitched. As to what that threshold is, I haven’t found a hard-and-fast-rule. I think ~2.8v is too high, and leads to a lot of perfectly good cells being pitched. I’ve decided to go with 2v as my cutoff and so far, so good.

BatteryU talks about cells becoming irreversibly and dangerously damaged if they stay below 1.5v for a week or more, so 2v leaves a big margin above that. Laptops will slow charge if some of the banks are below 2.8v. The low-voltage threshold given in battery datasheets is for cells being discharged under load, not for self-discharge of resting cells, it has safety margins built in for potential overshoot during discharge.

I’d be much more cautious with unprotected cells that have seen use in a flashlight or similar. In that case, I’d probably pitch them if the voltage was below 2.8v or so, since there is no way of knowing if the low voltage was due to overdischarge under load vs slow self-discharge.

.

shhyguuy
Offline
Last seen: 4 years 6 months ago
Joined: 12/26/2014 - 23:58
Posts: 8
Location: CA

Just cracked open my first laptop battery pack for my very first post. $12 free shipping on ebay. Condition: Used – “BATTERY WILL HAVE 1 OR MORE OF THE TOTAL 3 HOOKS, MISSING BROKEN

Manufacturer Lenovo
Battery Part # Thinkpad 42T4801
Battery Pack mAh 10.8V 8.7Ah 94Wh – 9 cells
Cell Name LG LGABC11865
Cell mAh 2800

The battery pack itself was a pain in the butt to open up and on the bottom side was a good amount of amazingly hard glue holding them to the plastic case.

For now, some voltage readings:

1 2 3 4 5 6 7 8 9
3.997 3.976 3.987 3.987 3.989 3.986 3.986 3.996 3.997

Average: 3.989 Range: 0.021

I’ll run them through the analyzer and see what we get. I’ll be labeling, re-wrapping, and adding protection circuits to these if they test out good.


image links to album

downlinx
downlinx's picture
Offline
Last seen: 3 months 3 weeks ago
Joined: 04/09/2014 - 09:38
Posts: 1292
Location: Indiana, USA

thread updated thanks shhyguuy

BLF Community Battery Pull Thread http://budgetlightforum.com/node/32720

Jubeldum
Jubeldum's picture
Offline
Last seen: 3 years 4 months ago
Joined: 11/02/2014 - 09:20
Posts: 2057
Location: Michigan

I ripped apart a Compaq Evo N600 14.8V 4400mAh with 8 cells. They are Chinese 18650C4 cells .


downlinx
downlinx's picture
Offline
Last seen: 3 months 3 weeks ago
Joined: 04/09/2014 - 09:38
Posts: 1292
Location: Indiana, USA

OP updated thanks for the post.

BLF Community Battery Pull Thread http://budgetlightforum.com/node/32720

Jubeldum
Jubeldum's picture
Offline
Last seen: 3 years 4 months ago
Joined: 11/02/2014 - 09:20
Posts: 2057
Location: Michigan

Dell Rechargeable Li-ion Battery TYPE C1295
11.1V 53WH
6 cells
CGR18650D
Li-ion
MH12210

eas
eas's picture
Offline
Last seen: 2 months 4 weeks ago
Joined: 07/14/2014 - 18:53
Posts: 1354
Location: PNW

Jubeldum wrote:
I ripped apart a Compaq Evo N600 14.8V 4400mAh with 8 cells. They are Chinese 18650C4 cells.


Was it a generic pack like the one in the amazon pic you used?

.

Jubeldum
Jubeldum's picture
Offline
Last seen: 3 years 4 months ago
Joined: 11/02/2014 - 09:20
Posts: 2057
Location: Michigan

It looks generic like the picture, no branding. Has a made in China sticker on the side. Whoever owned the laptop must have bought a aftermarket pack.

DavidEF
DavidEF's picture
Online
Last seen: 13 min 9 sec ago
Joined: 06/05/2014 - 06:00
Posts: 7220
Location: Salisbury, North Carolina, USA

I know, I know! Don’t trust eBay stuff. But, I thought it would be a decent deal, so I did it. I bought what was supposed to be a new, never used Toshiba PA3450U-1BRS laptop pack. It is a 4-cell pack, and the cells are Sanyo UR18650Y L43C, as Jubeldum found in another Toshiba pack a while back. They are 2000mAH cells.

Here’s the problem. I opened the pack and tested cell voltage and got 0.49v for all four cells in series! I thought maybe there was something going on with the balance charger circuit giving me a false reading, so I took it all apart and separated the cells. I got about 0.12v each or so. These are supposed to be brand new cells. Must’ve been REALLY OLD STOCK. |(

So, being the brave, daring (translation: stupid) person I am, I set out to charge them up, thinking that since they have never been used, maybe a jump-start will be all they need. Well, my Nitecore i4 charger just blinked at me, so I pulled them off, and tested about 0.26v on a couple of them. I figured that means the charger was bumping a little bit into them as a check for voltage/charge characteristics was taking place. I thought that looked promising, so I decided to go all out and be as stupid as I could be. I have an old phone charger wall wart that I cut the plug end off of a while back so I could use it as a power supply. It puts out 5.2v @ 1A. I held the loose wires to the positive and negative end of each cell for a little while (less than a minute each) and tested around 2.5v on each cell after that. Looking good! Wink

So, I put them back in my Nitecore i4 charger and they sat there charging for a couple hours. They got just a little warm, and after pulling them off, they each measured around 3.5v or so. I only took them off because they are as-yet unproven as far as safety, and I didn’t want to chance something happening overnight. I’ll put them back on charge this afternoon and see if I can get them to a full charge. Meanwhile, I’m going to contact the seller on eBay and see how well his/her conscience works. I obviously have “voided” any regular warranty they might have had. But still, the cells were bad and something ought to be done to rectify the situation.

The Cycle of Goodness: “No one prospers without rendering benefit to others”
- The YKK Philosophy

pilotdog68
pilotdog68's picture
Offline
Last seen: 2 months 3 weeks ago
Joined: 05/30/2013 - 23:31
Posts: 6424
Location: Held against my will in IOWA, USA

I can report that Milwaukee uses 10 Samsung 20R’s, at least in their 18v 4.0ah “RedLithium” packs.
…………………………
Are there any tool packs known to have 4.35v sells?

My Favorite Modded Lights: X6R, S8 , X2R , M6, SP03

Major Projects:  Illuminated Tailcap, TripleDown/TripleStack Driver

flydiver
Offline
Last seen: 50 min 10 sec ago
Joined: 06/19/2013 - 19:16
Posts: 930
Location: Seattle, WA
DavidEF wrote:
So, I put them back in my Nitecore i4 charger and they sat there charging for a couple hours. They got just a little warm, and after pulling them off, they each measured around 3.5v or so. I only took them off because they are as-yet unproven as far as safety, and I didn’t want to chance something happening overnight. I’ll put them back on charge this afternoon and see if I can get them to a full charge.

Be interesting to see if a cell that dead for that long has any probability of being useful at all….let alone safe. I doubt it IS dangerous, it’s probably too dead.

BTW, you know you can use low amp NiXX charging to bump a low cell up to charging range?

eas
eas's picture
Offline
Last seen: 2 months 4 weeks ago
Joined: 07/14/2014 - 18:53
Posts: 1354
Location: PNW
flydiver wrote:
DavidEF wrote:
So, I put them back in my Nitecore i4 charger and they sat there charging for a couple hours. They got just a little warm, and after pulling them off, they each measured around 3.5v or so. I only took them off because they are as-yet unproven as far as safety, and I didn’t want to chance something happening overnight. I’ll put them back on charge this afternoon and see if I can get them to a full charge.

Be interesting to see if a cell that dead for that long has any probability of being useful at all….let alone safe. I doubt it IS dangerous, it’s probably too dead.

BTW, you know you can use low amp NiXX charging to bump a low cell up to charging range?

I think a lot of people are too conservative in their choice of cut-off voltage for scavenged cells, but trying to charge Li-ion cells that were well below 1.5v for months or years is, to me, sheer madness.

In general, I think NOS packs with anything less than ~2,400 mAh nominal cell capacity are probably too old to be worth the trouble, unless you find it in a recycling bin.

If people are looking for inexpensive packs on ebay, try this $12.95 pack. I haven’t ordered one, since I still have a huge number of NOS and used packs to go through, but it looks a lot like the (now unavailable) $12 NOS Acer packs that have yielded so many nice pink Samsung 2,600 mAh cells. I’ve used cells from those packs that were ~2v (most were higher) when I pulled them and they are doing great.

.

202bigmike
Offline
Last seen: 1 day 10 hours ago
Joined: 07/23/2014 - 12:09
Posts: 856
Location: USA

I need help identifying some laptop batteries.

#1—Lenovo Thinkpad-5.2 AH-10.8v
Battery #‘s___LCQM2B8—with a “D” on battery body
Battery Wrap Color___Red with Lt. Blue Tip—(+)

#2—Dell—TK330—56WH—10.8v
Battery #‘s___LLLM4C9—-with a “C” on battery body
Wrap Color___Red with Blue Tip—(+)

#3—I don’t remember which battery pack these are from.
Battery #‘s____JIUFK17—-with a “D” on body
Wrap Color____Red with Green Tip—(+)

Star EDIT :——I forgot to mention the Red wraps
are kinda transparent with the #‘s printed on the
metal battery bodies. The #‘s can be seen thru the
wraps , if this helps to ID them.

I have looked and I can’t find out any info on these
batteries. Can anybody ID these batts or point me
to the right places to look for the proper ID info ?
I also have more batteries , I need to find out the
ID info.

eas
eas's picture
Offline
Last seen: 2 months 4 weeks ago
Joined: 07/14/2014 - 18:53
Posts: 1354
Location: PNW

They all sound like Sanyos. I think the red wrap means 3.7v nominal, 4.2v charge termination.
Light blue is probably 2,600 mAh, green might be 2,400 mAh. I don’t know about the Blue, but given the rating from the pack, I’d guess 2,600 mAh too.

.

Ronin42
Ronin42's picture
Offline
Last seen: 4 months 3 weeks ago
Joined: 12/17/2014 - 22:17
Posts: 1759
Location: Alameda, CA

Is it just me or does it make sense to get a charger that can give you either iR (Internal resistance) or mR (mean resistance) reading right up front, so we can consider if we even want to put a specfic cell on a charge cycle?

I have had great luck with the LiitoKala Engineer Lii-260 and Lii-300.

for half of what a resistance tester costs I get a charger for free. and with no fan noise.

my $.02

(“It’s good that most people can’t remember their previous lives. Otherwise
things would be a lot more complicated than they already are.”
Ajaan Lee Dhammadharo)

DavidEF
DavidEF's picture
Online
Last seen: 13 min 9 sec ago
Joined: 06/05/2014 - 06:00
Posts: 7220
Location: Salisbury, North Carolina, USA
flydiver wrote:
DavidEF wrote:
So, I put them back in my Nitecore i4 charger and they sat there charging for a couple hours. They got just a little warm, and after pulling them off, they each measured around 3.5v or so. I only took them off because they are as-yet unproven as far as safety, and I didn’t want to chance something happening overnight. I’ll put them back on charge this afternoon and see if I can get them to a full charge.

Be interesting to see if a cell that dead for that long has any probability of being useful at all….let alone safe. I doubt it IS dangerous, it’s probably too dead.

BTW, you know you can use low amp NiXX charging to bump a low cell up to charging range?


Yeah, I’ve done that before. In fact, that’s what gave me the idea for using this wall-wart to do the same thing. My NimH charger didn’t have slots big enough to stick a 18650 into, so I had to cobble something together with wires and magnets to make it work. This, I just held in my hand, holding the bare leads to each end of the cell. If it hadn’t jumped up in voltage so quickly doing that, I wouldn’t have bothered with them any further. But, to go from 0.26v up to 2.5v in less than a minute made me think it might be worth trying to get a real charge into it, especially since they are supposed to be new, never used. I still have yet to get a full charge, though. I put them back into my charger last night for a few hours, but again had to pull them before finishing, because I’m not going to leave them charging overnight at this point. After last night’s charge, they measured around 4.0v each. I wish I had a hobby charger to test capacity and run-time.

All the 18650 cells I have are pulls from DEAD laptop batteries. The highest any of them tested when I pulled them was around 4.0v, IIRC. But, a lot of them tested below 3v, and some tested below one volt. I even had a really old pack in which none of the cells tested above 0.9v, and I was able to get a charge into most of them. Did I happen to mention I’m partially insane? When I was a kid, my favorite things to play with were the dangerous things. I liked fire, electricity, strong chemicals, and sharp knives. I’m only a little less crazy these days. J) But, let me reiterate that I thought these cells would be NEW and that’s the only reason I bought them. I can’t return them, because I tore the pack apart, so I’m trying to see if there is any hope for them.

The Cycle of Goodness: “No one prospers without rendering benefit to others”
- The YKK Philosophy

Lancman
Lancman's picture
Offline
Last seen: 1 year 7 months ago
Joined: 11/26/2014 - 15:35
Posts: 352
Location: UK

I bought a ‘New’ generic laptop pack off eBay and it was completely dead. All 6 (unbranded) cells were reading 0.4v or less. Luckily the seller gave me a full refund without question. Just as well as I had already ripped the pack apart. Wink
As I had nothing to lose I s l o w l y got them up to 3v using the NiMH setting on my hobby charger, then a normal LiPo charge at 0.5A. All 6 got to 4.2V without getting even warm and all have been working fine in low-amp lights ever since. Capacity is about 60-70% what it should be but as they were free and I have 6 to play with, I’m happy.

202bigmike
Offline
Last seen: 1 day 10 hours ago
Joined: 07/23/2014 - 12:09
Posts: 856
Location: USA
eas wrote:
They all sound like Sanyos. I think the red wrap means 3.7v nominal, 4.2v charge termination. Light blue is probably 2,600 mAh, green might be 2,400 mAh. I don’t know about the Blue, but given the rating from the pack, I’d guess 2,600 mAh too.

Do you know if there’s some place that I can check
to find out the actual Brand name and mah info of
any batteries based on the numbers & symbols that
are printed on them , when no Brand name is ?

Photons Away
Photons Away's picture
Offline
Last seen: 1 year 4 months ago
Joined: 08/24/2014 - 18:25
Posts: 216
Location: Terra Firma

Correct this if it is not right but in considering testing/charging laptop pulls in order to get an idea if they are safe or not it would be good to

1) Check if the battery has about 2.5V minimum first. If under 2.5V-toss into the recycle bin.

2) Attempt charging and check the temperature while charging so it does not get too hot. If too hot take off charge and toss into recycle bin (after it cools down).

3) Take out of the charger after at least three hours and measure voltage having let the battery sit about two hours to see if it has retained at least 4.1V. If the voltage has dropped under 3.9 V then toss into recycle bin.

This is considering one does not yet have a charger/tester that can measure internal resistance or capacity (mAh). Later when a charger/tester is obtained that can measure internal resistance and capacity how and where in this example would these fit in?

Also if the new capacity in mAh is not available what should be done?

Does this about sum it up safety-wise?

One other thing is that the flashlight to be used if the batteries turn out all right is a single 18650 light.

The charger will be some simple 18650 charger with one slot and not digital.

Thank you for any advice.

EDIT - Changed minimum voltage.

herong1111
Offline
Last seen: 4 years 4 months ago
Joined: 02/02/2015 - 02:58
Posts: 16

i think that is good .

Pages