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Jason McNeil

King Song Battery Bank for Extra Range

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Posted (edited)

Sorry for bumping this.

I just saw on ewheels that the new KS S18 has the option to extend range with this battery bank, but misteriously this battery bank does not appear anywhere.
Is it still a thing, or the ewheels comparison is made so that ks comes better compared to the V11?

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Cheers!

Edited by Struck
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I emailed and asked - the 780wh one is $650.  I don't think it is listed on the webpage. 

It is still a thing - I didn't realize how long these external chargers have been out.  Seems like a perfect addition to the s18

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Posted (edited)
On 6/20/2020 at 1:28 AM, Ben Hatfield said:

I emailed and asked - the 780wh one is $650.  I don't think it is listed on the webpage. 

It is still a thing - I didn't realize how long these external chargers have been out.  Seems like a perfect addition to the s18

Indeed. I love large batteries for range (the reason I'm getting a Sherman, not a S18), but dont need to lug it around every time.
I wonder how much of those 780Wh make it as charge on the internal battery. (the efficiency)

edit: the connector should also be stronger or stabilized ideally, as there will be play / stress.

Edited by null

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Posted (edited)
On 6/20/2020 at 1:28 AM, Ben Hatfield said:

I emailed and asked - the 780wh one is $650.  I don't think it is listed on the webpage. 

It is still a thing - I didn't realize how long these external chargers have been out.  Seems like a perfect addition to the s18

How is it a thing, and is not in the webpage?

And on which webpage? This is weird A.F. because this is not just a bunch of cells and a BMS, it needs more electronics to control the amps delivered, it surely needs a dc-dc transformer (or several).. And not offered to the wide market? And I guess you have contacted the ewheels page... but, where is it on the kingsong official page? Do they sell kingsong products that not even kingsong promote?

thx

EDIT: Powerbank exists in the official kingsong page: https://www.kingsong.com/list-45.html

But not in https://www.kingsong-europe.com/ or https://www.kingsong.es/  or any other store...

Edited by Struck

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16 hours ago, Struck said:

How is it a thing, and is not in the webpage?

And on which webpage? This is weird A.F. because this is not just a bunch of cells and a BMS, it needs more electronics to control the amps delivered, it surely needs a dc-dc transformer (or several).. And not offered to the wide market? And I guess you have contacted the ewheels page... but, where is it on the kingsong official page? Do they sell kingsong products that not even kingsong promote?

thx

EDIT: Powerbank exists in the official kingsong page: https://www.kingsong.com/list-45.html

But not in https://www.kingsong-europe.com/ or https://www.kingsong.es/  or any other store...

The two other links are from dealers, not operated by KS HQ 

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French Video of using the King Song external battery in a back pack with a wheel.

 

If you use it for for on the go charging at the max of 5A x 84v = ~420watts.

If you get the largest 780wh external battery (in your back pack) .. it will take a minimum of 780/420= ~111 minutes to discharge the external into the wheel.

If you had a KS-S18 with 1100 wh base + 780wh in back pack = ~1880wh combined over ~111 minutes = average use rate of ~1016 watts over that ~111 minutes .. any faster watt use rate and you'll run out of internal battery faster than external .. any slower watt use rate you (ride for more minutes) and run out of external battery faster than internal battery.

 

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Trying to use that while riding without some sort of quick-release/breakaway cable i think is a bit crazy.

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On 6/24/2020 at 3:14 AM, Jack King Song said:

The two other links are from dealers, not operated by KS HQ 

Yes, but still, it doesn't look like it can be bought anywhere

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E-wheels told me 5-31-20 that they had the 780wh size in stock.

So , If you want to buy one .. just contact them.

yeah it's odd they haven't listed it on their web store .. but you can still just contact them and buy it.

 

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E-Wheels US only (+ Canada). For the time being I don't want the battery pack, I am just surprised that it exists nowhere

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Folks, I have a ks-16S ...67v So, my friend got this ebike external battery pack... Can I take advantage safely? It is a 60V 12Ah,lets say 720wh... Sure it got its own BMS as you'll charge this to the wall directly... As I've read before, If I charge this on the wall to 100% and I charge the EUC to 100, and then I plug it, and then I boot/start the euc, should it be all ok? ¿Or am I missing something? tks in adv for any feedback! A 16s "1560wh" sounds attractive indeed :)  

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i would imagine it's only going to work once ur device gets under 60v as im assuming ur trying to plug the external into the normal charging port

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44 minutes ago, someguy152 said:

would imagine it's only going to work once ur device gets under 60v

60V should be just the nominal voltage. So 67.2V if fully charged...

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Posted (edited)
On 6/30/2020 at 11:08 PM, Seba Barcia said:

Folks, I have a ks-16S ...67v So, my friend got this ebike external battery pack... Can I take advantage safely? It is a 60V 12Ah,lets say 720wh... Sure it got its own BMS as you'll charge this to the wall directly... As I've read before, If I charge this on the wall to 100% and I charge the EUC to 100, and then I plug it, and then I boot/start the euc, should it be all ok? ¿Or am I missing something? tks in adv for any feedback! A 16s "1560wh" sounds attractive indeed :)  

The external battery pack is meant for charging another battery pack?

If not I wouldn't do it. You need something to limit the amps. When charging a battery pack what limits the amps is the charger. I do not expect neither that battery or the charging port of the kingsong wheel to have an amp limiter when charging.

Be careful!

 

EDIT: Okay, I see you meant to have both be discharged at the same time by matching voltages at the beginning.. I think this would be fine.. Just make sure you measure the voltage before you connect them and don't assume anything. There is just the issue that 10amps may flow through a wire (in the wheel) that is not expecting more than 2/3 when charging.

Btw, regenerative braking will only be sent to the ewheel battery (I am pretty sure there is a diode there preventing outflow). But since then the external battery will have then lower voltage, this seems feasible.

Edited by Struck

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On 1/18/2019 at 9:57 PM, Seba said:

An external battery (in any form), optionally connected to the unicycle is not such a simple matter. If the internal battery has a different voltage than the external battery, there is a risk of severe sparking during connection, and consequently there is risk of burns to the user. In addition, battery that is more charged will charge the less charged one, which can cause the battery with a lower voltage to exceed the permissible charging current limit significantly. This can result in damage to the battery or even in a fire. These problems could be solved by using additional special electronics inside the EUC. However, this would increase the cost of the device, while reducing its reliability.

Thanks for saying this, @Seba hearing it from possibly one of the best known pioneer and experts in the euc community really helps give credibility to this knowledge. A small nobody like me telling people not to mess with batteries only ends up with doubt from the people I try to warn.

Preventing fires is not your own personal problem guys, it's a responsibility from each one of us early adopters to help prevent EUCs from being banned. Each one of us play the part when we are out riding to be an ambassador for EUCs to have a permanent place in society. Let's not deny future generations their right to enjoy this amazing technology.

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