Hi wondering about the problems of using refurbished Samsung 30q nkon cells
https://eu.nkon.nl/samsung-inr18650-30q-3000mah-15a-refurbished.html
Are they ok to use in a pack?
For spot-welding yeah
And I think fogstar is about the same price new…
1 Like
For nese modules are they ok to use?
I am interested in those and a few one types of refurbished cells on Nkon
They should be ok ?
I think they’ll cause issues
2 Likes
Oh why?
You need to have roughly the same internal resistance for things to evenly discharge and you don’t want any one cell to end up far over discharged in a p group or else when you go to recharge that one bad/worse cell will bring down the average and so you may end up overdischarging or overcharing a given cell depending on how you divide up the more or less worn cells between P groups. Actually vid here talks about issues with cooling causing similar problems because of varying the effective internal resistance of some cells in a battery TIM thermal paste
1 Like
I mean every cell has some variance from the published numbers and of course they would say that but it is a roll of the dice really, maybe it’s “worth it” if getting a good enough deal but lots of time and effort to make a good battery DIY so would think start with higher quality cells but if they are really all the same IR and roughly same life I don’t see a major issue but again don’t know if one cell had 200 cycles and the other had 100 so maybe losing a lot of cycles on the overall battery. (It’s a crapshoot)
2 Likes
Nese modules rely on perfect physical contact with the electrodes. The nickel on the refurb cells prevent perfect contact
6 Likes
K thanks for the help probably will do fogstar
You are right! I thought that kmph was MPH
The fastest speed on an electric skateboard is 95.83 km/h (59.55 mph) and was achieved by Mischo Erban (Canada/Czech Republic), at Portorož airport, Piran, Slovenia, on 27 October 2015.
Mischo also holds the record for ‘Fastest skateboard speed downhill (standing)’.
1 Like
perhaps
1 Like
I’m looking for motors
My setup will be a 12s battery (Samsung INR18650-30Q cells), 200mm wheels (8’) with a 72t pulley.
The aim is to get to 40 km/h top speed.
From what I’ve read I have to look towards 170kv motors and lower, considering I want maximum torque for offroading I’d like it to be sensored.
The closest I’ve seen to my ideal is this.
Any recommendations ?
Thanks in advance 
Little question- have a dual flipsky esc, but only 1 motor is working as of now. Can I run it with just the one motor attached or will it damage the esc? Thanks!
It shouldn’t damage the ESC. Just set it up as if it is a single and insulate the wires on the other side just in case.
2 Likes
After months of distraction I am back building. My Flipsky Smarty Pants Switch arrived today. The only hardware issue I have left is the motor wires with the extensions I got won’t reach the VESCs without being stressed. I ordered more extensions a couple weeks ago but lets get serious, my esk8 extension cords aren’t at the top of anyone’s attention list at the moment. I need advice.
Splice extra wire sections into the damn extensions I have or wait for the ones I ordered?
How long and what connectors? I’ll make you some this weekend.
2 Likes
You are too good to me. I’ll PM you tomorrow.
So I have decided it would be best to attach everything to the board and just have the enclosure come off with nothing in it but foam with cutouts. That seems to be counter to what most people do here. Am I making a mistake for some reason I don’t get?
2 Likes
That’s how I typically build. Use the enclosure as a bash guard. A lot of people build in the enclosure and then attach it to the deck. I rarely do that, personal preference.
5 Likes
i’ve been looking for a new bms for another pack and quite like the diebiems and found this website, anyone know if its legit ? http://fojiken.com/