Beginners Guide to Processing 18650 Cells | Cell Database


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Electric Kid four wheeler battery
#11
https://www.youtube.com/watch?v=Q2w5Ka2oNv8
This dude went into the nitty gritty of the pack.

Looks like nominal charge per cell is 2150
nominal voltage is 3.65 v
constant current is 1075ma
contant current 4.2 v
end condition(cutoff) is 2.75 ) whats that ?????
max charge 4.2 V
max discharge current 10A
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#12
End condition(cutoff) is when the bms will actually shut down power going out from the cells. Keeps them from being depleted too far. 40+mins is a loooong video review on these. Wow
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
Dollar Shave Club. Best Razor I've ever used
Certified 18650 Cell Reclamation Technician
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#13
Every day i learn something is a good day.
Yeah . That guy had a lotta time to spare. Ordering 3 packs of these saturday
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#14
This is how my pack for my 4wheeler looks like to the kids. Its 24V though:


Follow me! >> 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
Upcomming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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#15
I also 18650fied a 24V scooter, used 7s5p to make it even a little faster Big Grin . But I also changed the speed controller and added a 20A bms (motor has 500W, looks the same as in your quad video, Daniel) to the pack for more safety. And I used cells from an ebike (3500mAh) because of the higher discharge rate. Now it runs like hell for more than 2 hours... Cool 

Have sun and always wear a helmet Wink

Cells tested: 4238 (overall: 8077 Ah, average: 1906 mAh)
Cells in production: 2240 (overall: 4704 Ah, average: 2100 mAh)
Powerwall config: 7s320p, 672 Ah, 16 kWh
What's left: my current grid consumption

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#16
That may be a project for the future . For now i just want extended range . Speed doesnt really matter . (yet. ) I do plan to build an electric motorcycle for my self though to go with the bike collection. But thats another day and lot more dollars .
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#17
What battery protection are you guys using? I'm looking for something that will cut output at 3.2v or thereabouts.
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#18
No protection on my pack more than a LOUD beeper for rc. I have no built in BMS since i charge it with a RC charger.
Follow me! >> 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
Upcomming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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#19
I use a cheap bms from China, cutoff is around 2.4V, as far as I remember... bought it from Banggood...

Cells tested: 4238 (overall: 8077 Ah, average: 1906 mAh)
Cells in production: 2240 (overall: 4704 Ah, average: 2100 mAh)
Powerwall config: 7s320p, 672 Ah, 16 kWh
What's left: my current grid consumption

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#20
Ordered 2 of the packs looks like they should be in sept 12th.
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