![]() Hart Batteries: An In-Depth Look Types and Models If they don’t, you could be headed for a breakdown. Hart and DeWalt batteries have specific voltage requirements that must align with the tools they power. Different tools need different amounts of voltage, much like various cars need different types of gas. Imagine trying to fit a square peg into a round hole it just won’t work! Voltage Requirements Though they might look similar, small differences can make them incompatible. The connections between Hart and DeWalt batteries are as unique as fingerprints. Connection Differences between Hart and DeWalt The connection points and voltage requirements are crafted to suit individual tools, ensuring optimal performance. Think of it like a jigsaw puzzle each piece fits exactly where it belongs. I would suffuse a fuse on EVERY lead going to the battery, but at the very least one on the positive battery terminal mounted as physically close to the battery as possible.Ever wondered why one battery doesn’t fit all tools? Batteries have specific designs to match the tools they power. Your best bet is to use a fuse that blows with less current then any wire it feeds Thicker wire is less safe because MUCH moe current will flow before it melts through and opens the circuit. Some peole might think you can make the project more safe by using thicker wire. But you know that can't be actually true. Yes, the copper in the wire just "disappears". These batteries can instantly turn a length of copy wire, even rather thick wire into flying bits f melted metal. This mean replacing the fuse needs a solder iron. But the noise was hear in the other room and we had to open windows to let out smoke.Īn easy was to add a fuse is to simple "dreamer" the power trace on the PCB so as to open the circuit and solder a 20 amp fuse across the gap you made with the dremel. Fortunately only minor second degree burns then healed up well in about a week. was holding the cable when it caught fire. I barratry like this can VAPORIZE a #8 wire. Why? I built something that uses a battery about this size and thought I had circuit protection but didn't and accidentally the wires shorted. In fact I'd go as far to suggesting taking to project off-line until the PCB is modified to include a fuse. I you REALLY need to add a fuse to the PCB It would be very easy to add one or even two. Thermal, over-current and discharge protections are bypassed with an adapter like this, so shorting the terminals, letting the battery get too hot or too deeply discharged will likely permanently damage it or worse. The tools normally used with these batteries provide important protections against various adverse conditions. Alternatively, you can flip the layer in Kicad, move the C3 terminal to the other side of the C1 terminal, and then plot the top copper layer. If you are not using the Flatcam workflow(build.txt), then be sure to mirror both the gerber and excellon files 1" above the X axis. Note that the gerbers included with this project plot the bottom copper layer. They can be used to attach extra wires or components, if desired. The middle two barrier block terminals are not connected to anything. The PCB can be screwed into the adapter body or glued, making sure that the PCB sits flush or just under the inside surface of the adapter body. The middle terminals on the PCB should be cut down to half-height as shown using a dremel or file. Trace isolation, holes, and board cutout are all done with the same 0.025" regular length end mill. ![]() The circuit board was milled on a Nomad 883 Pro CNC. The adapter body was printed in PLA with a 0.3mm layer height. ![]() If the C1 and C3 terminals are connected without the switch depressed, two cells are shorted together which instantly bricks the battery (won't charge or run tools.) These are normally used for cell balancing during charging, but with the switch depressed, they can be connected together to produce 60v at the B+/- terminals. ![]() The Flexvolt battery incorporates a switch in the body of the battery which, in part, controls if the battery is wired up in series (60v) or parallel (20v.) The other piece of the puzzle is the connection between the C1 and C3 terminals. ![]()
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