Charge Any 18V/20V Lithium Ion Battery with Hart 20V Charger

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Charge Any 18V/20V Lithium Ion Battery with Hart 20V Charger

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
Sat, 01 Feb 2025 12:02:15 -0800

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Title: Hart 20V Power Tools Battery Interface
Weblog: GearHack
Excerpt: 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 b . . .
Tracked: Mon, 15 Sep 2025 16:55:20 -0700

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