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Old Sep 15, 2014, 03:27 PM
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Israel, Jerusalem
Joined May 2007
137 Posts
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Free good batteries source

I have found a very good source for very good batteries.
Laptops battery packs include an electronic circuit which fail sometimes. When this happen, the service center replaces the whole battery pack. Then they have to properly dispose of the batteries.
Then I come to visit, once a month, and get about 10 packs, which I break down, and in 50% of them I normally find very good batteries.
This particular brand uses Samsung LiIon cells, rated at 1850 maH. The cells are welded 4 or 3 sets of 2 in parallel for each pack (4S2P or 3S2P), and I use in the model 4 cells, 2S2P, giving me 3999 maH at 7.6 V.
It does not get any better. They are free. I helped the service center dispose of them and they are very reliable, hold the charge for a long time and have a low internal resistance.



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Old Sep 15, 2014, 03:37 PM
supreme being of leisure
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Tel Aviv, Israel
Joined Jul 2004
2,291 Posts
are these by any chance 35x50mm prismatic cells?
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Old Sep 15, 2014, 07:39 PM
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United States, WA, Woodinville
Joined May 2014
598 Posts
Most laptop packs are 18650 cells. I've been salvaging them for years whenever I find a discarded pack at work. I haven't used them for RC but they are useful for rebuilding other laptop packs and I have several flashlights that use them.
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Old Yesterday, 12:11 AM
supreme being of leisure
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Tel Aviv, Israel
Joined Jul 2004
2,291 Posts
yeah, i have lots of 18650 cells, mostly 2600mAH. i make them into 2S receiver packs for my gas and glow planes, my TX also uses a 2S pack.

1850mAH is something smaller.
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