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Electric Bicycle Batteries and Accessories Discussion about battery options and different accessories like voltmeters, speedometers and other things to add to your e-bike

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  #11  
Old 01-02-2017, 08:17 PM
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ultralight01 ultralight01 is offline
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Default Re: 18650 cell questions

I get the point KC. 1KW is plenty with gears.
I'll build one of these after my predator 79cc mountain bike.
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  #12  
Old 01-11-2017, 09:17 PM
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ultralight01 ultralight01 is offline
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Default Re: 18650 cell questions

Could one not use hoverboard batteries linked to incread Amph? https://www.wish.com/c/570b64aae0868...y8caAo8K8P8HAQ

Seems like 3 of these linked for 12amph and a 36v kit would make for a good combination
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  #13  
Old 01-12-2017, 07:31 AM
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cannonball2 cannonball2 is offline
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Default Re: 18650 cell questions

While that is possible you might want to consider that these are only rated at 5c or 20amps. Depending on your controller you could exceed this rating with results like seen on the news.

The construction is 18650s. If you are going to run Li based batteries I would stay with The LiPo based battery. More power density, more C rating and from what is seen recently less of a hazard. I think the issue with the hover board packs is the use of inferior cells. I bet the sellers are dumping these type of packs.

Be careful!

Last edited by cannonball2; 01-12-2017 at 07:42 AM.
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  #14  
Old 01-12-2017, 09:22 AM
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cannonball2 cannonball2 is offline
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Default Re: 18650 cell questions

Run two of these for $156.

http://www.ebay.com/itm/Taotuo-22-2V...kAAOSwj85YONps

These would be great for a 48v system because the low cut voltage usually around 42v is in line with the 3.5v/cell generally used a max discharge. You can run em on a 36v or even a 24v if you use a voltage alarm to alert you on the low voltage cut. Cost about $11 and runs off one of the packs balance plugs. The motor doesn't care how much voltage is put to it with in reason, usually depending on phase wire size. Most controllers have 63v caps so they easily handle close to that. Its just the LVC that is different and of course max amperage output. A 24v controller will have slower acceleration and hill climbing than a 48v because the 48v has a higher max amperage. However the 24v controller will still give the max voltage.

I have one total(motor/controller) 24v system that I run on 12s which is 50.4v off charge. Never had an issue with it.

Moral of this story is with in parameters you can pretty much do what you want with the systems. There are some modded 9c 48v hub motors running over 100v over at the Sphere.
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  #15  
Old 01-12-2017, 10:30 AM
KCvale KCvale is offline
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Default Re: 18650 cell questions

Quote:
Originally Posted by ultralight01 View Post
Could one not use hoverboard batteries linked to incread Amph?
Sure, and put some Samsung phone batteries in series with them for extra explosive power!
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  #16  
Old 01-12-2017, 07:38 PM
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ultralight01 ultralight01 is offline
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Default Re: 18650 cell questions

Cannonball, That looks like a great battery. More affordable than an ebike battery for sure.

It was interesting to learn how you can modify electric motors to basically run any way you want, you've just gotta be a science nerd to figure it all out.

But I'm half gearhead, half nerd.

I see electricity in my future.
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