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

Batteries and Chargers Rechargeable Batteries
124

This thread needs to be stickied so it can be easy to find.

I tore apart some laptop battery packs last week. I’m new to this and this was my first tear down. I’m not sure what capacity these batteries are. Maybe one of you guys could figure it out?

Working Pull. Sanyo UR18650Y L43C Light Red, Green tip. Toshiba PA3534U-1BRS 10.8v 4000mAh. 6 cells Test 3.53v

Working Pull. Samsung ICR18650-26C Pink, White tip. Dell Type WW116 11.1v capacity 56wh. 6 cells Test 3.99v

Working Pull. Samsung ICR18650-22F Light Green, White tip. HP 485041-002 10.8v 47wh. 6 cells Test 2.53v

Non Working Pull (Wouldn’t Charge). Samsung ICR18650-20B Light Blue, White tip. High Capacity Power Products aftermarket for Sony Vaio, 14.8v 4000mah 8 cells. 2 cells Test 0.00v DEAD! 6 cells Test 3.77v

Non Working Pull (Wouldn’t Charge). Sanyo UR18650F Light Red, White tip. Gateway 600YGR 3UR18650F-3-QC-7 11.1v 5700mAh. 9 cells Test 2.59v

125

  • Sanyo UR18650Y spec'd to 2000mAh
  • Samsung ICR18650-26C spec'd to 2600mAh
  • Samsung ICR18650-22F spec'd to 2200mAh
  • Samsung ICR18650-20B spec'd to 2000mAh
  • For those UR18650F's I'd say they're 1900mAh granted they came out of a 9-cell pack.

Here's a post in the Buried Treasure thread that should help some bit when hunting for cells in laptop packs.

126

Thanks everyone for the patience, the OP has been updated.

127

I Just did my first laptop pull… My old Asus EeePC 1000HD with a busted screen kindly donated it’s battery pack. The battery pack name was PL32-901 and was rated at 8700mAh. It was easy to bust open and not much glue. Inside I found six cells which would be rated at 1450 mAh each.
Edit: As pointed out below the battery pack was 7.4V, not 3.4V, so they are 2900 mAh each.

128

Nice score. Those cells aren't 1450mAh, they're 2900mAh!

129

thanks for the post MIKE C and Otanacious is right, those are 2900mAH cells and OP updated

130

Oh? The battery pack had a rating of 8700 mAh on it. Divide that by 6 and it’s 1450. Is it common that battery pack ratings are not the same as cell ratings?

131

your math was a little wrong, you needed to divide by 3 not 6

132

I looked up what voltage those packs the EeePC use run at, and they state 7.4V, and 3.7V nominal in 2S is 7.4V. Also I assumed the configuration is 2S3P after seeing the pictorial proof and capacity rating. In the end 8700/3 = 2900.

Now I want to go out and hunt for those high Wh/mAh 2S3P packs since I've never tore one open yet

133

Of coarse! Didn’t think of that at all. Thanks.

134

I’ve updated my post that you link to. Thanks.

135

thanks Mike C

136

I did a laptop pull recently, a Lenovo 45N1173, 10.8V 8.7Ah - 94 Wh. I got 9 cells, all measured at 4.08V. I think it is Panasonic 2900mah.

137

i will get this added asap thanks

138

Nice thread guys! Sticky’d.

139

A few days ago I tore apart a battery pack previously installed in an ASUS K52J series. The pack was rated for 11.1V 5200mAh and the cells inside were LGs. Specific model: LGABB41865 2600mAh

2 of them show 0V, I will put them in the battery recycling bins.
2 of them show 3,66V.
2 of them start off at 3,5V and then drop and drop and drop until they reach zero. They reach 0 volts after 10 seconds of measuring. I have disassembled a few packs and I’ve never seen such behavior. I’m measuring the voltage using a Fluke multimeter. Anybody has any explanation for this weird cell behavior?

140

that is a little wierd to just drop to 0 volts after a few seconds, i have never run into that. But i will update op with your findings.

141

That was the remnants of their ‘electrical soul’. You sucked it right out and killed them. :bigsmile:

Take a look at the fall off curve on lithium. These batteries were essentially dead and on the last tiny bit of the vertical component of their discharge.
You can do the reverse > take a freshly ‘dead’ battery, charge it for just a bit on a low amp NiXX circuit and it will rapidly bounce up to 2-3v but there is still essentially no capacity there.

142

Did my first battery pull today. HP 437403-541 met it's end. Unfortunately I do not own a multimeter so no voltage test for now. But I should be able to measure it at work.

As you will be able to see in the photos I found Samsung ICR18650-26C (Samsung SDI 775) batteries inside. Their data sheet says:

Samsung SDI ICR18650-26C

Nominal Voltage 3.6V

Nominal Capacity 2600mAh

Lithium Contents 0.78g

3.6V surprised me a bit, I expected 3.7V. Or is it normal?

Update:

One set of 3 showed 2V, other - 2.65V. Hopefully I'll be able to charge them.

143

thanks kaiser, updated OP with your pull.