Voltage sensing and current draw leads
The voltage sensing leads (small wires) are not dependant on length. You can make tem any length you want. They need to be connected to something that is soldered directly to the battery. That is why we make them separate from the current wires (large wires). There is a voltage drop at the point where the current jumps from the battery terminal to the current clip. If you solder them to the current clips, or attach them to the current clips, the voltage is being measured after the drop occurs. A typical error would be about .30 volts with a 30 amp discharge rate. That means your 6 cell pack will cut off at 5.70 volts instead of 5.40. The current carrying wires can be lengthened, but if you want to discharge single cells at 35 amps, the wires will need to be kept original length. The calibration of the unit is not dependant on wire length, but its ability to control current at the extremes may be compromised when a lot of wire is added.
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