dewalt battery terminals are not marked, I need to know which is which
If your cutting off the car charger adapter and splicing the wires look at the wires. One wire coming out of the charger is rounded and one has flat edges. The rounded wire is your positive lead and the edges is your negative. To insure your correct go to the charger where the wires comes out just in case you had already split the wires. Last resort is to take the charger apart and look how the wires are terminated. Remember if you cross polarity when wiring up you will smoke it. Hope this helps
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get a mason jar and fill it with salt water. get two stripped wires and put one end of each in the water, touch the other two ends to the terminals of the battery.
The wire with more bubbles coming off is the negative side.
. I've only seen one DeWalt battery and it wasn't 18V, but on that one, the negative was on the left side (holding the drill with the chuck pointed away from you).
. A voltmeter, as per Sparkington, is your best bet.
Um easy way that I know grab a digital multimeter connect one prob to one side off the battery and the other prob to the other side. If you get a -18 volts you have that means your have figure that red lead off the multimeter is negative and the black lead off your multimeter is positive. This is an easy way to tell. hope this helps.