Motor wants to much amp while pulling up

[izeman]

Oke oke oke i know now haha.
Wel that was 500€.... shit.
Thanks for the responses

you're welcome. and FYI: a 18s13p with 30q high current cells, and a decent BMS is in the 1.500.- range if bought from a shop (that has to build it, and give warranty).
but then you have a DECENT, very powerful battery that will give you a lot of riding fun and TONS of current.
my calculation: 18x13 cells = 234 cells. let's say 5.- per cell = 1.170.-. BMS: around 100.-. building it (incl connectors, wires, solder, nickel, etc ...) 200-300.-

 

[Sunder]

Hello,

I put 1 amp load on 1 batery.
It drops from 4,2 tot 3,75

So how bad is it?
I think the cells arw not 2c eating as the say they are.
But still, they ar knew and only cost 2 dollar a pop. And they do have 2400mah

Sorry to be the bearer of bad news, but as I said in one of my earlier posts, the maths simply didn't add up. There was just no way that you had a good battery, but at least now you're under no illusions.

If you are convinced that the batteries genuinely hold 2400mah per cell, but simply can't handle the drain, there is one thing you can possible do: hook it up in parallel with a small battery that has very low internal resistance. The better battery will supply the power during heavy draw. As soon as the load goes off, the voltage will bounce back up, and the bigger poor quality battery will charge the smaller high quality battery.

You would want something with a very small IR to make this work: nanotech/graphene LiPo or LTO. Anything less and you'll destroy the small battery through too high charge/discharge cycles in no time.

Alternatively, start the process with consumer affairs for a refund. €500 is cheap for a battery of that spec, but its still a huge suum of money for junk.

 

[bendeman]

Hello,
I just cald the suplier and he wanta ro chexk for himself.
The cells he has are good. I mayby have a bad batch.
So there is a chanse i get new cells with are good amd rated at 5 amps.

I wil let you guys know when i hear somethong from tje celler.

 

[Manny]

i see cell fuses. do you know the type and rating?
they could have resistance.

 

[izeman]

i see cell fuses. do you know the type and rating?
they could have resistance.

resistance maybe, but not to the amount we see here. they would need to be super thin steel

 

[Ykick]

Strange someone with good shop skills would go through all this trouble building 18650 pack without 1st testing/checking cell IR? It’s very easy to do IR testing and qualify the true C rate.

OP did the measurement work but just didn’t do the math…