Begginers Guide to Processing 18650 Cells | Cell Database


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Electric Kid four wheeler battery
#1
I have the 12 volt 12 ah kids four wheeler from wal mart . The thing runs for about 1min 20 seconds and its dead. Soo. To get some practice in i am going to swap from the old heavy battery to some of the cells from ebay

http://www.ebay.com/itm/NEW-LG-36V-4-4AH...0005.m1851

Obviously will have to take them apart such to change them into 12 volt. The original battery compartment is 4and a half inches wide 6 inches long and 4 inches deep . The 18650 cells are all close to the same size avg right .  I am trying to see how i will need to configure my cells.
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#2
Depending on what the electric motor can handle, you could possibly be able to use 4s configuration. If it can handle 14v without issues, use 4s. If you find it's not supposed to go over 13, then 3s would be needed. Then just pack as many in parallel as possible to fit the space.

To get the specs on the motor, you should be able to find some model numbers on the electric motor itself. Then do a google on it and hopefully you can get a spec sheet on it.
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#3
I done a quick 20 min search online . It looks like theres not a lot of info on the motor. I went outside to see if i could easily see the motor and as i figured i couldnt see it easily . prob would have to take it all apart I found a site selling them that said due to the face people insisted on upping voltage there was no warraty so i guess i will play it safe and keep to the 12 volt setup it has right now just fill it up with 18650s 3s

00968-2938 is the only part number i found online.
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#4
Ive done 4s no problem as 99% of those motors are generic brushed DC motors and can handle up to 15V
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#5
Yeah, I personally don't think 1.5 - 2V will make that big of difference. For one, it's not going to be needed to crank out a whole lot of constant torque. And another, it's not like it's gonna run for hours on end. (the kid gets tired, or the batteries die Wink )
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
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Certified 18650 Cell Reclamation Technician
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#6
How many cells did you use with yours . Im a super newb to this stuff. But at least i can solder had to learn from my drones motors needing resoldering

(08-27-2017, 10:53 PM)nokiasixteth Wrote: I done a quick 20 min search online . It looks like theres not a lot of info on the motor. I went outside to see if i could easily see the motor and as i figured i couldnt see it easily . prob would have to take it all apart I found a site selling them that said due to the face people insisted on upping voltage there was no warraty so i guess i will play it safe and keep to the 12 volt setup it has right now just fill it up with 18650s  3s

00968-2938 is the only part number i found online.

(08-28-2017, 12:33 AM)Korishan Wrote: Yeah, I personally don't think 1.5 - 2V will make that big of difference. For one, it's not going to be needed to crank out a whole lot of constant torque. And another, it's not like it's gonna run for hours on end. (the kid gets tired, or the batteries die Wink )

I dont think that kid ever gets tired . Right now anything would be better that the ragedy battery thats in it . I figured what a good way to start and get my hands on it at least something i can get some solid numbers on so when i get to the hardcore house stuff i dont have to guess and wonder if i add this i maybe will get that.
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#7
Any of you guroos that know the sizes of this stuff know about how many i can fit in the compartment . The original battery compartment is 4and a half inches wide 6 inches long and 4 inches deep obviously need to have a little room in there. Looks like there about .95 inches around and 2.6 inches long . Looks like i can put 8 cells on the bottom and probably get 4 stacks of 8.
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#8
Depends on what type of pack you build. Are you going to hot glue the cells together, or are you going to use those plastic holders, or something different all together? If you hot glue, then you can stagger the cells so they fit tightly together and maybe get more in there.

Also, i would recommend using the high drain cells instead of the laptop cells. That is, the cells that come from cordless tools. You may not have as much run time with them, but you won't have to worry about them overheating on you, or rather, under the kid while they are using it. Just a thought.
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
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Certified 18650 Cell Reclamation Technician
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#9
(08-28-2017, 07:04 PM)Korishan Wrote: Depends on what type of pack you build. Are you going to hot glue the cells together, or are you going to use those plastic holders, or something different all together? If you hot glue, then you can stagger the cells so they fit tightly together and maybe get more in there.

Also, i would recommend using the high drain cells instead of the laptop cells. That is, the cells that come from cordless tools. You may not have as much run time with them, but you won't have to worry about them overheating on you, or rather, under the kid while they are using it. Just a thought.


I will probably just 3d print me some holders that way if a cell ever does die i can replace it. Glue would prob be easier  with more . But a few hours of runtime on it is plenty .I was thinking of the ones that i posted on the first the lg 36 volt taking two or 3 apart and making a battery .  Is there some you are seeing that is better ?
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#10
Just really any cells that are rated for like 10C or higher. That will give you best/safest pack for that kind of load (the electric motor AND the kid Wink )
If a cell can handle 10Amps or higher discharge, that would be good use. Just need to make sure you check the cell datasheets to verify.
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
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Certified 18650 Cell Reclamation Technician
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