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Hart 20V Power Tools Battery Interface

20 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
Sat, 29 Apr 2023 00:47:11 -0700

Thanks for the technical details, Rick. Will definitely be helpful with jury-rigging these batteries for other purposes.

Sun, 30 Apr 2023 17:44:10 -0700

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.

Mon, 07 Aug 2023 07:38:48 -0700

HI,Rick is wrong,the ID chip is Ti BQ26100

Thu, 26 Oct 2023 01:27:05 -0700

Sorry,I made a mistake,not Rick wrong, is Raven wrong

Thu, 26 Oct 2023 01:30:27 -0700

TI bq26100 data sheet and specifications attached.

Attached File: TI bq26100 SHA-1 HMAC-based security and authentication IC with an SDQ interface.pdf (517 KB)

Wed, 03 Jan 2024 11:04:20 -0800

How do we fake out the two vertical pins to build a battery adapter for Hart 20V tools?

Wed, 03 Jan 2024 15:50:03 -0800

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.

Mon, 29 Jan 2024 07:02:05 -0800

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?

Tue, 27 Feb 2024 12:18:26 -0800

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