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18650 cell voltage 6.4V
#1
Hi

I am ripping my first batch of laptop batteries and have come across a few anomalies.

A fully working laptop battery Dell FV993 11.1V 97WH with 9x 18650 model Samsung ICR18650-30B and all cells are testing at 6.04-6.45V each.

I thought that my Voltmeter may be faulty so I tested a rechargeable 1.5V AAA battery and that returned 1.7V. Also opened another laptop battery and tested the cells - all around 3.4V

The third battery pack with 3 cells Samsung ICR18650-30B also 1st cell 1.82V and the remaining two 5.46V and 5.48V

Is Voltage above 4.2 possible for 18650 and what should I do about the 5V+ ones?

Thanks
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#2
overcharged
Building Lifepo4 Powerwall - atm 3400 cells growing
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#3
(04-24-2019, 09:51 AM)emuland-metroman Wrote: overcharged

Is that terminal or can the cells be recovered?
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#4
(04-24-2019, 09:56 AM)dwarflundgren Wrote:
(04-24-2019, 09:51 AM)emuland-metroman Wrote: overcharged

Is that terminal or can the cells be recovered?

Are you measuring across the terminals of a single 18650, after it's been dismantled from the pack ?
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#5
(04-24-2019, 09:59 AM)Sean Wrote:
(04-24-2019, 09:56 AM)dwarflundgren Wrote:
(04-24-2019, 09:51 AM)emuland-metroman Wrote: overcharged

Is that terminal or can the cells be recovered?

Are you measuring across the terminals of a single 18650, after it's been dismantled from the pack ?

Measuring a single cell after being removed from the pack.
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#6
Certainly overcharged, you'll know what affect that's had on its capacity after you've fully tested it.
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#7
I have almost never seen cells being at above 4.5V... I would like to see an image of you checking the terminal and also how you crosscheck the voltmeter against another proper source.

A voltmeter with faulty battery generally give very very weird results!

Cells at 6V.. Doubt that but il take it back if its true Smile
ajw22, bogptrsn, chuckp And 3 others like this post
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Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
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#8
Thumbs Up 
(04-24-2019, 01:37 PM)daromer Wrote: I have almost never seen cells being at above 4.5V... I would like to see an image of you checking the terminal and also how you crosscheck the voltmeter against another proper source.

A voltmeter with faulty battery generally give very very weird results!

Cells at 6V.. Doubt that but il take it back if its true Smile

That was a great call - thank you!
I changed the battery of the voltmeter and the 6.5V cells now read 4.15. Big Grin
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#9
This is why I own more than 1 volt meter lol... if everyone agrees with each other, you know you're in business.
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#10
Faulty battery is Common Smile

Yeah i have more than 1 voltmeter to because of this Smile
The Ultimate DIY Solar and build place
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcoming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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