Below are instructions on making high voltage/current cables for electric vehicles/motorcycles. This method is a soldered joint that is extremely strong, and does not require/use a crimper.

The eMoto parts list shows that you'll need these parts: 

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1) Copper lugs for battery cables (Qty = 25): $15
WebPage

2) Battery cables (welding #4 wire, 18 feet): $28
Purchased from Ebay 

3) Heavy gage solder  (can be purchased locally or online)

4) Solder flux (click here for a definition, can be purchased locally or online)

5) 3M 1/2''-diameter Heatshrink ((FP-301H) rubber shrink wrap for cables, available at all electronics stores or online)

6) Tools: Propane torch, welding (or fireplace) gloves & pliers 

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Step #1: Drill a small hole in your copper lug as shown below (just through the first wall)

Step #2: Cut your cables to the proper length

Step #3: Strip (remove the rubber coating from) the cables on both ends, so that the copper part can reach all the way inside the lug. 

Step #4: Apply solder flux to the exposed copper of one end of the cable.

Step #5: Light the propane torch

Step #6: Slip the copper lug over the exposed/stripped cable

Step #7: [use gloves now] Hold the cable (with lug dangling on the end) in one hand, and a string of thick solder in the other hand. Place the lug over the flame and allow it to get hot. Put/hold/press the solder into the drilled hole on the lug. Once the lug reaches the melting temperature of the solder, the flux with suck/wick the melted solder down into the joint. I was amazed how well the solder sucked down into the hole. Note that the solder will be attracted to the flux, and will not go anywhere else. It's very easy and clean. Be careful not to get the flame too close to the rubber cable part (it will melt). Keep applying the heat and the solder as necessary - and fill the entire inside the lug until it starts flowing out.

Step #8: The joint will cool very quickly (after being removed from the flame/heat), so [with gloves] shove the lug into place (tight against the copper wire) as it is cooling. It will form a rock-solid joint. 

Step #9: Let it cool.

Step #10: Slip a piece of heatshrink over the lug and wire and apply a light amount of heat.

Repeat to make many cables! Here is the finished product:

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