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  #81  
Old 11-07-2016, 01:01 PM
nedfunnell nedfunnell is offline
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Don't buy the cheap high capacity 18650s unless you like house fires. They are fake.
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  #82  
Old 11-09-2016, 01:26 AM
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6.5hp 6.5hp is offline
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Quote:
Originally Posted by Krash View Post
possibly the best source of cheap high rate cells would be RC suppliers such as hobby king.
yes I had been thinking about hobbyking and I think I found the best deal.
https://hobbyking.com/en_us/turnigy-...ngle-cell.html
these 5000mah 20C batteries would be far more reliable and they're still very cheap.
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  #83  
Old 11-15-2016, 09:54 AM
mgrzyb16 mgrzyb16 is offline
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Originally Posted by 6.5hp View Post
Edit: I found some better value ones, 10x 3.7v 6000mah with a charger for $27. Thanks for pointing those out!
don't know about the quality or reliability though!
Those are fakes one for sure. "Real" 18650 capacity is 3400 mAh. I was thinking about this solution 'cause:
1. Tesla uses 18650 as power source for their cars.
2. They are quite cheap and easy to find (every laptop battery contains few 18650).
So.... I was thinking about getting some 18650s from laptop batteries and start with it.
ps. Even if laptop battery is "dead" few cells are for sure ready to recharge and reuse.
ps2. Be careful with them. I mean really careful.
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  #84  
Old 11-21-2016, 12:11 AM
Krash Krash is offline
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18V liion battery drills typically use 18650's. They would be a handy source as they come pre packaged with battery management built in. They are a bit expensive per kWh, but the up side is they will probably have a much higher peak current rating than laptop cells and should be good quality if you buy a decent brand plus you can use them with your battery tools when not using the gokart.
I have also seen the a 40V whipper snipper, chainsaw, blower liion battery pack advertised at less than the price per kWh of bigger brand 18V batteries.
Electric bike battery packs are cheaper still and also come with battery management built in.
Don't skimp on battery management or your cheap pack will become an expensive door stop.
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  #85  
Old 11-25-2016, 04:30 PM
mgrzyb16 mgrzyb16 is offline
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I found in Poland 18650s with 10 amps peak and 2250 mAh measured minimum capacity for 1,5$. My source is telling me that this comes from "bigger pack that has some electronic issue" so they are not used but he can't sell them as new. Anyway - that's a very good price. Hobbyking 5k mAh comes for 7 bucks which is 2 times more expensive.

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  #86  
Old 12-29-2016, 01:12 PM
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I saw this at hf and was wondering, 40V Lithium 14 in. Cordless Chain Saw. Could it be used for a small electric go kart or mini bike? Not sure rpm or hp on it. But you would get battery charger and motor for ~$150. Only need controller? Maybe buy two, one for each tire
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  #87  
Old 01-02-2017, 10:38 AM
nedfunnell nedfunnell is offline
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Quote:
Originally Posted by pRoFiT View Post
I saw this at hf and was wondering, 40V Lithium 14 in. Cordless Chain Saw. Could it be used for a small electric go kart or mini bike? Not sure rpm or hp on it. But you would get battery charger and motor for ~$150. Only need controller? Maybe buy two, one for each tire
Here you go:

http://www.etotheipiplusone.net/?p=4187
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  #88  
Old 09-20-2018, 02:10 AM
adr826 adr826 is offline
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Default Rectactor circuit

In addition to the three ways you have listed to throttle the kart there is a Rectactor circuit.

http://www.evdl.org/docs/rectactor.pdf

Its a way to progressively switch a motor that maintains the balance across the batteries. It uses 2 heavy diodes and 2 heavy duty switches to switch from 2 batteries in parallel at 12 volts to 2 batteries in series at 24 volts. This can be duplicated to use higher voltages at 24 v intervals. You can switch from 12 to 24 to 48 volts and so on using this scheme.
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  #89  
Old 07-08-2019, 11:25 AM
bigblkblazin bigblkblazin is offline
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I just realized this post was from 2011..
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  #90  
Old 07-08-2019, 11:56 PM
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landuse landuse is offline
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I just realized this post was from 2011..
Still good info though
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