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Hart 20V Power Tools Battery Interface20 volt input with the slim terminal as Positive + (wire is even red) it's also labeled as such on the board inside. The Diode array appears to be 94 volts (LJ-1 94v-0) with my power supply I started at 20 volts with all functions operating as advertised. I then throttled back down to 12 volts and below where I began to observe some dimming of the lights output. At 17.5 volts we get a triple flash but maintain full performance even below 15 volts. It does operate in the 12-15 volt range but I can not attest to any possible adverse which may come along with its use at those voltages for any extended period of time. -Note- it does require a minimum of 16.1 volts to start operating again once power has been disconnected. This is good new for me as it will serve as a utility light on our golf cart whose batteries are 8 volts each. I Scored 4 of these units recently at my local Walmart 39180 they were on clearance for $5.00 each. I sold 3 and kept one whose box was previously opened. I have no Hart batteries currently nore do I plan on acquiring any in the future. So this was the perfect unit to do some testing and full disassembly on. Any question you may have, I'll be happy to entertain but my knowledge is limited so we may can learn together. I can supply some photos if requested. Thanks for the meeting place provided for us here today! Rick D. Rick Dunaway Thanks for the technical details, Rick. Will definitely be helpful with jury-rigging these batteries for other purposes. Joe Soooo I did some fiddling with this. The two vertical stacked connectors. The "wide tab" on the charger is a communications pin. This is a one wire bus with a DS250X memory device on it. This is used to ID the pack to the charger. The skinny one is a temp sensor. I think its a 10k NTC thermistor. at roughly 77 degrees it reads 10k. Raven HI，Rick is wrong，the ID chip is Ti BQ26100 Martin Sorry，I made a mistake，not Rick wrong， is Raven wrong Martin TI bq26100 data sheet and specifications attached. Jake How do we fake out the two vertical pins to build a battery adapter for Hart 20V tools? Thomas Interesting. I wonder how much of that device's functionality is actually used vs just reading the ID and calling it a day. BTW the chip you mentioned looks like the DS250X when doing a simple bus scan. To answer the fake out question, you don't if it actually uses the the bq26100 chip features. Raven I really don't care too much about the BQ26100 features. I really just want to use some other batteries with the HART tools. How would we go about doing that? Thomas the key inside bq26100 is the key to run HART tools with other brand battery! skinny Did we ever figure out what's inside that little chip? Roger C Wow this post really helped me out. I'm trying to find or make an adapter so I can connect 20v dewalt batteries to my 20v hart tool. Is anyone else also doing what I'm trying to do? I think there are some on Etsy or eBay but I noticed they all are 3d printed. Makes me wonder if there is a 3d print file out there. Would be helpful since I have my own 3d printer and I don't mind making my own. Also it's interesting some tools have five or three pins but both are 20v. Xerkies Weird, I covered up the vertical wide positive terminal and it still works. Makes me wonder what's the point of that terminal? Xerkies Hi Xerkies, Every tool is different. Which Hart tool did you cover up and still works? Duke The most effective workaround seems to be using the circuitry from an old Hart battery and connecting the 20 volts from a new battery to that circuitry. I haven't tried it myself, but has anyone given it a try? Burk Found a way to get Hart 20v charger to charge any 20v battery. There is a test point on the PCB that carries a 20v charge with a small jumper from there to the charging terminal and your good. The red light stays on but it is charging. Notmyusername
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