Dahon Jetstream conversion

[cwah]

Hello,

Because I didn't spent time to properly equilibrate all my cells when I created my battery, I have 2 cells at 4.2V while other charge up to 4.06-4.10V.

It's quite a high difference and I'd like to be able to discharge them manually

I have jst-xh male plug coming out of my battery for easy checking. I just need another just-xh with a small resistor to discharge it.

Problem is that I'm not home and I don't have any equipment with me....


Any idea how I can sort that out?

Thanks

 

[cwah]

I think I found the solution:
With U=RI, the cell voltage is about 4V and I need to discharge to about 15-20W or 5-6A.

So 4V/6A = 0.66R

So I need a 0.66ohm resistor:
http://www.ebay.co.uk/itm/50W-Arcol-Aluminium-Clad-Wirewound-Resistor-0R68-0-68R-/300909840244?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item460f9fc774

And this jst-xh plug:
http://www.ebay.co.uk/itm/Lipo-Balance-Extension-Charger-Cable-Lead-4s-JST-XH-220mm-/300698608879?pt=UK_ToysGames_RadioControlled_JN&hash=item460308a4ef

I don't have a soldering machine, I'll just make some wires nodes.

Is it all good?

 

[Deleted member 4366]

It's rated at 50w, so should be OK.

 

[cwah]

Perfect thanks dave

 

[shemozzle999]

Hi cwah,

WARNING​

You will burn out the plug at 6A they are only rated 3A and the balance wires will get hot!

http://www.jst-belgium.be/downloads/series/eXH_1.pdf

 

[Deleted member 4366]

Hi cwah,

WARNING​

You will burn out the plug at 6A they are only rated 3A and the balance wires will get hot!

http://www.jst-belgium.be/downloads/series/eXH_1.pdf

Good point. Well presented.

 

[cwah]

Yeah but it's for 3A constant. I'll only discharge for 30mn to 1 hour so it should be ok

 

[cwah]

The quick release alternative arrived:

It does fit, but it's a bit too long for my bike. Probably need a bit of dremel on it

 

[cwah]

Steel cable tie from my torque arm has been teared in 2. Not enough to handle 2500W BPM. I need to get another one... maybe 2 other steel tie? Ideally I should bolt it but I don't have equipment with me (no drills or drill bits)

 

[Geebee]

I suspect your dropout will be damaged with that much rotation, you need to remove the wheel and check it.
You can by small U bolts that would be much stronger.

 

[Cyclezee]

Hi cwah,

I think you need to mount the first part of the plate set, i.e. the piece that fits over the axle in another position so that you can easily fit 2 Jubilee type clips.

You don't need a drill, just couple of spanners and ones that fit properly, the axle nut is looking rather chewed. You also need a screwdriver.

 

[Cyclezee]

I suspect your dropout will be damaged with that much rotation, you need to remove the wheel and check it.
You can by small U bolts that would be much stronger.

Good point Geebee,

The dropout may well be damaged and that axle nut needs to be replaced, clearly the clip broke as it is the weakest part.

 

[cwah]

Sanity check..

Dropout looks ok, but the steel clip has been torn.. These are definitely not stainless steel clip

 

[cwah]

any shop open today I can go in london?

 

[peerjay56]

Sanity check..

Dropout looks ok, but the steel clip has been torn.. These are definitely not stainless steel clip

Isn't that a crack, top right?

 

[cwah]

the clip cracked. But dropouts look fine

 

[Deleted member 4366]

Fix it to the disc brake mount like this:

 

[Geebee]

Just for safety's sake please check the area between the red lines, it may be a scratch but looks like a hairline crack.
Don't want you injuring yourself

 

[cwah]

where in the picture did you see it?

 

[cwah]

not the cleanest but I'm not home.. so no drill or drill bit. So just 2 jubilee clip. I'm also ordering a second torque arm from john for safety