S for SPEED
P for PLEASE MORE RANGE
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more P can also increase pack lifetime
more S can also increase failure rate
range is really S * P but for the same combination only, like 10S6P and 12S5P, where they are both 60 cells, then the one with more S could get a tiny bit more range due to decreased losses in the ESC. But it also stresses the ESC more and can reduce the ESC’s lifetime. However, less S can also increase range a tiny bit because your top speed is lower, which reduces drag. Since the ESC losses are linear and the aerodynamic drag losses are exponential, less S would actually give a tiny bit more range unless you geared it up to the same top speed. But we are splitting hairs here, range is almost entirely determined by
- number of cells
- your riding style
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That’s not funny
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Ok so interested in a premade backpack battery deal. But states 50a max discharge. 21Ah capacity, 36v. Is 50amps enough? (I know it isn’t ideal)
Yes, it’s plenty. I have 4 of my skates set at 29A max in the ESC settings.
Are you going to be able to do burnouts when the light turns green? Nope.
Is it enough? It is 100% enough to have a really fast esk8 that you will have loads of fun on.
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50A battery max is fine but will stress the cells quite a lot if you ride hard. Its better to overengineer the battery pack to lessen the stress on the pack.
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It is not a VESC - it is a random used ESC of ebay origin…
Once I have my third board ready I might violate @b264’s principle of never touching a running board and upgrade it to a VESC.
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Also what @bollen said. Even if the pack is rated for 50A, run it at 30A. It will last longer and fail less.
Cheers guys.
Never buy a battery unless you know what cells are in it.
“Samsung” or “Sanyo” etc tells you almost nothing about what cells they are. That’s like describing a car you’re going to buy as “a Ford”. Yeah, but which one?
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That’s why. Braking profiles are pre set on there. What’s worse, the new wheels are larger in diameter and heavier. This will hurt your braking performance.
A Vesc will let you control brakes. And sounds like you need it.
I had many times where I mashed to fill brakes at 20mph with my ownboard esc and hubs and felt like nothing was happening. It’s scary. Get a Vesc
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Is 33.6v for a 12s battery voltage cutoff fine?
For final cutoff? It’s fine. A tad low, I would suggest 2.9 per cell. Once you go below 3.0, there’s really not much power left anyway.
I have my 12s cutoff starting at 38.4 and ending at 34.8 and I feel like most people would say that is on the low side.
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Haha, my other board (Zhong) with Ownboard ESC and hubs has fabulous brakes in comparison to this one… yes, I need a VESC.
The only regret I have with Zhong is to not have bypassed the BMS - Braking on a full battery, it will cut off the brakes, sending me to to street.
Why do you want the battery in a backpack?
Now I am trying to imagine a backpack in a battery… 
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Don’t know mate. Considering doing something different. Have you seen this? Morpheus | Backpack MTB | Refined Commuter. Just looking really. It’s in an auction site. If it’s cheap I might bid
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Feel free to ask whatever you want. I’m test riding the latest iteration with Unity tonight.
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