12 Year old 18650 harvesting / capacity results

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Pavithra_uk
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12 Year old 18650 harvesting / capacity results

Battery: MOLI ICR-18650E
Source: Network brand Pentium 3 laptop (manufactured year 2000 August. Stock battery pack)

Got a broken Network (looks like German brand..) brand P3 laptop. I take out its battery pack. its say 10.8V 4500mAH.
Inside pack, there are 9 MOLI ICR-18650E batteries in 3S3P method. I guess it each cell 1500mAH. And cells made in canada

Its around 12 years old.. and there are cosmetic marks show laptop hardly used.
I checked each cells. every cells had reading 3.69V – 3.74V :bigsmile:

The man who give me laptop say its worked until last year.

I did a Capacity test with My IMax B6 (not a original Imax b6)

Cell charged to 4.2V @ 0.5A and rested 1 hour.

Discharge current : 1A, cutoff voltage 2.8V

1180mAH over original capacity of 1500mAH = 78% :bigsmile: capacity after 12 years Silly

gunner12
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Those batteries seem to be doing pretty well after all this time. Maybe it has to do with how often they are used, it’ll be nice to have a well used old laptop to see how well they hold up.

Pulsar13
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After 12 years, still much better than most cheap Ultrafire cells.

ryansoh3
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Good for you! I guess they are safer than XXXFires.

Did you mod your iMAX B6 to for the USB connectivity?

Was it hard?

Cheers! Beer

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Pavithra_uk
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ryansoh3 wrote:
Good for you! I guess they are safer than XXXFires.

Did you mod your iMAX B6 to for the USB connectivity?

Was it hard?

Cheers! Beer

Never did any changes to Imax charge except turning on USB mode via menu.

I had USB to RS232 cable but it didn’t worked. I had to do logic level mod to that by using transistor & two resistors. its not a hard.

Can help if you going to make that setup yourself Beer

ryansoh3
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Pavithra_uk wrote:

Never did any changes to Imax charge except turning on USB mode via menu.

I had USB to RS232 cable but it didn’t worked. I had to do logic level mod to that by using transistor & two resistors. its not a hard.

Can help if you going to make that setup yourself Beer

Wow, never head of the mod you did. Smile

I’ll get my Turnigy Accucel-6 in a couple of weeks so hopefully it’ll work out well.

I’ll definitely help you with the mod. Do you think your iMAX doesn’t support the USB to RS232 mod? Is the circuitry entirely missing?

Just wondering, don’t you already have USB connectivity? 8)

Cheers! Beer

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Pavithra_uk
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ryansoh3 wrote:
Pavithra_uk wrote:

Never did any changes to Imax charge except turning on USB mode via menu.

I had USB to RS232 cable but it didn’t worked. I had to do logic level mod to that by using transistor & two resistors. its not a hard.

Can help if you going to make that setup yourself Beer

Wow, never heard of the mod you did. Smile

I’ll get my Turnigy Accucel-6 in a couple of weeks so hopefully it’ll work out well.

I’ll definitely help you with the mod. Do you think your iMAX doesn’t support the USB to RS232 mod? Is the circuitry entirely missing?

Just wondering, don’t you already have USB connectivity? 8)

Cheers! Beer

First I used USB to RS232 cable (actually it USB to RS232 port adapter that came with CDMA land phone)
I connect Imax’s serial output to RX pin of RS232 port. but logview show wrong data. output of Imax data pin is very high impedance
So I had to put transistor with high value resistor to boost / level convert signal.

However you don’t need any mod if you’re use correct RS232 convertor

ralf
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Pavithra_uk wrote:
1180mAH over original capacity of 1500mAH = 78% :bigsmile: capacity after 12 years Silly

Yeah, older, lower-capacity batteries are generally more robust than newer, higher-capacity batteries (one of the trade-offs for higher capacity, plus cost-cutting is often a factor). I did a capacity test on a set of NiMH AAs a few months ago: 1005 / 1064 / 1080 / 1087 mAh. They’re Olympus-branded 1300mAh cells purchased in November 1998! And they have been through perhaps 200 cycles and have not been given best-practice treatment, having spent years between charges (and thus years completely self-discharged) more than once.

ryansoh3
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Haha, sorry, I thought you were asking for help and I was slightly confused.

Anyways, the Accucell 6 arrived yesterday and I’m testing it out.

Will report back on it when the RS232 converter arrives too.

I’ll probably do a review of them both, perhaps a tutorial.

Thanks! Beer

Pavithra_uk wrote:

First I used USB to RS232 cable (actually it USB to RS232 port adapter that came with CDMA land phone)
I connect Imax’s serial output to RX pin of RS232 port. but logview show wrong data. output of Imax data pin is very high impedance
So I had to put transistor with high value resistor to boost / level convert signal.

However you don’t need any mod if you’re use correct RS232 convertor

BLF ≠ B-grade Flashlight Forum

 

CheapThrills
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Great test!
I´m amazed, that they have not gone lower than that in voltage!

Very rare to see this kind of tests.

Boaz
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I think it's child abuse and endangering  to get  12 year olds to harvest laptop  cells ...shame on you ..:P

 

http://www.newscientist.com/gallery/dn15141-photographs-depicting-essential-issues-of-our-time/5

http://www.flickr.com/photos/81504640@N00/2537057221/

Of course children are actually doing it ...really sad

       καὶ τὸ φῶς ἐν τῇ σκοτίᾳ φαίνει καὶ ἡ σκοτία αὐτὸ οὐ κατέλαβεν

                            

       Dc-fix diffuser film  >…  http://budgetlightforum.com/node/42208

Pavithra_uk
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Boaz wrote:

I think it’s child abuse and endangering  to get  12 year olds to harvest laptop  cells …shame on you ..:P

 

http://www.newscientist.com/gallery/dn15141-photographs-depicting-essential-issues-of-our-time/5

http://www.flickr.com/photos/81504640@N00/2537057221/

Of course children are actually doing it …really sad

Silly Silly

I meant 12 year old laptop cells

photon1k
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I just harvested 6 Panasonic CGR18650CG cells from a three year old Lenovo pack that had sat unused for more than a year. Four were at 2.5v and two were at 2.74v. I’ve been slowly charging them at 50mA to bring up the voltage a bit and then let them sit for a few hours. I have yet to fully charge them, let alone discharge them, but during the rest periods the cell voltage has not dropped appreciably, so I’m hopeful! :bigsmile: