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  #21  
Old 07-14-2019, 11:40 PM
bigblkblazin bigblkblazin is offline
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I have never seen anyone make a battery pack out of AAA batteries .... 100 AAA in series = very very low capacity . You would need 800 of them for a 8 minute ride.
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  #22  
Old 07-15-2019, 03:33 AM
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Originally Posted by N!ck View Post
Quick question: why is it not possible to link up say 100 AAA rechargeable NiMH batteries, each has 1.2v and 900mAh so ultimately that would give me 120v and 90Ah... found them on hobby king.
because that'd give you 120V 900mAh in series
or 1.2V 90Ah in parallel.

If you want both 120V and 90AH at the same time you need to have 100 in parallel
and 100 of exactly such packs in series

resulting in 10000 batteries! (70ct a pop or such.. 7k dollars)
That's why!

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  #23  
Old 07-15-2019, 07:10 AM
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Free motor doesn't mean good motor.

The way you're going about this is like being given a free iPhone charger and trying to build an iPhone out of broken walkie talkies just for the sake of using that charger.
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Old 07-15-2019, 07:14 AM
N!ck N!ck is offline
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Fair enough, makes sense. Can someone explain how those little electric scooters can run for super long and have enough torque and rpm to move a person like 10-15 mph? Like, how can such a tiny motor with small ish battery be able to do that while the one I have canít. Also how could I duplicate such a setup on like lime or bird scooters and put them on my bike?
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Old 07-15-2019, 07:31 AM
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Originally Posted by N!ck View Post
Fair enough, makes sense. Can someone explain how those little electric scooters can run for super long and have enough torque and rpm to move a person like 10-15 mph? Like, how can such a tiny motor with small ish battery be able to do that while the one I have canít. Also how could I duplicate such a setup on like lime or bird scooters and put them on my bike?
Because they use motors designed for the purpose and large lithium ion battery packs.

The weight and rolling drag of a scooter demands far less power than a go kart.

They only go 10-15mph, and the range isn't REALLY all that great.

And when did we go from go kart to e-bike? I must have missed something.

Double the weight, quadruple the power. Double the speed, quadruple the power. Double the speed, 10 times the weight, increase the range, and you have some massive total power demands. That's why a scooter can go so far at 10mph with a relatively small motor and battery compared to a go kart.
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Old 07-15-2019, 08:18 AM
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E-bike is simpler and cheaper cuz I donít have to make a whole frame etc. Again, this is my first time making anything like this so I just wanna try it out for cheap.

So any idea what kind of motor and battery Lime scooters use?
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  #27  
Old 07-15-2019, 08:23 AM
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Originally Posted by N!ck View Post
E-bike is simpler and cheaper cuz I don’t have to make a whole frame etc. Again, this is my first time making anything like this so I just wanna try it out for cheap.

So any idea what kind of motor and battery Lime scooters use?
Nothing big enough for an e bike...

To my knowledge, those scooters use a brushless motor integrated into the wheel hub. They make them for bikes, which is by far your best bet from an efficiency and reliability standpoint. I haven't taken one apart, but I'd guess the battery pack is either a LiPo brick or an 18650 pack.
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Old 07-15-2019, 08:28 AM
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'super long' is a relative term, no?

I have an electric skateboard with a reasonably high powered set of motors (1600W in total)
and I can run off my small batpack (7.5Ah) for days (short use per day )...
but I can because I use maybe 100-120Watts on average;
not going anywhere near the top speed (frankly 19mph on a skateboard is freaking me out)
not even half that usually

If I try to climb my local hill with it it'd be dead in a matter of minutes.
AS would it be if I'd floor it for long enough (without face planting that is)

Officially it has a range of ~11mls per charge (18km)
with it's 167Wh batpack
BUT drawing the actual maximum of 1600Watts it'd be dead in just over 6 minutes
(climbing hills, pulling full throttle etc..)

For me it lasts for about an hour and a half (that's why I think I'm avaraging between 100 and 120Watts)

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