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Author Topic: Salvaging old Notebook battery  (Read 366 times)

CPR

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Salvaging old Notebook battery
« on: April 09, 2018, 08:21:43 AM »
Hi,

I just found an old notebook battery in my cellar and decided to give it a try. I was able to salvage 8 x 18650 cells. 6 are still on 3.71V, 2 are on 2.1V unfortunately.
After googling I found out that those are 2600mAh cells. Pretty neat!

https://sep.yimg.com/ty/cdn/theshorelinemarket/LG-18650-2600.pdf

Is there a way to revive those cells on 2.1V or are they gone?

I think about a 3s2p battery bank with a built in BMS. Would give me 11.1V for the 817nd. I think thats quite good, I could use a step up converter to boost the voltage if necessary (or if it makes sense).


gil

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Re: Salvaging old Notebook battery
« Reply #1 on: April 09, 2018, 08:36:51 AM »
They really charge up to 4.2V, then go down quickly to 4V. Don't discharge below 3V. I would trash those two bad cells...
Gil

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CPR

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Re: Salvaging old Notebook battery
« Reply #2 on: April 09, 2018, 08:54:55 AM »
I just put them into the ThruNite 18650 charger. Let's see if the 2 cells will revive or not.

RadioRay

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Re: Salvaging old Notebook battery
« Reply #3 on: April 12, 2018, 10:19:31 PM »
This is a very good topic. D'oh!  I just remembered an old, beater laptop that may be in my junk box.  Maybe a weekend project??? (Like I ?NEED another 80% completed project... ha ha)

>Ray
"When we cannot do the good we would, we must be ready to do the good we can."  ~ Matthew Henry

CPR

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Re: Salvaging old Notebook battery
« Reply #4 on: April 13, 2018, 07:01:45 AM »
All 8 cells work. My charger is charging them. The question is if they can still deliver the same Wh as before, I doubt it.
Anyway, if your cell wont load because the Voltage is too low, attach it parallel to a charged cell for few seconds and then put it in the regular charger again. Saw that on yt, seems to work.

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gil

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Re: Salvaging old Notebook battery
« Reply #5 on: April 14, 2018, 04:44:00 AM »
Awesome. You save a lot of money by salvaging those cells.

Gil.

CPR

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Re: Salvaging old Notebook battery
« Reply #6 on: April 20, 2018, 06:47:50 AM »
My cheapo bms and cellholder arrived today. The presoldered wiring is to thin, i'll have to change it.
With 4s2p I should get about 5.2Ah on roughly 14V. The initial charge is high on those, over 16V, i will need a converter.

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caulktel

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Re: Salvaging old Notebook battery
« Reply #7 on: April 20, 2018, 10:29:05 AM »
I used to be in the computer business and recycled hundreds of laptop batteries and now that I know about reclaiming these 18650 cells I was only able to find one old pack which netted me 6 good cells:-(  I need to keep a eye out for some more, only now they seem hard to come by. Figures.

Joel
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CPR

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Re: Salvaging old Notebook battery
« Reply #8 on: April 20, 2018, 10:58:35 AM »
As soon I ask someone for an old notebook battery they ask why. After I explain why, they won't give me a me the battery any more haha.

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