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Do not connect B+ directly to the ID or T pins.
Important Compatibility Note: While Hart, Ryobi, and Ridgid are all TTI brands, Hart batteries are not mechanically compatible with Ryobi tools (the slide rails differ). However, the electrical pinout is nearly identical to Ryobi’s 20V system (B-, T, ID, B+). Hart 20v Battery Pinout Diagram
[B+ (T1)] ----[Cell 5+]
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[Cell Group]
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[B- (T5)] ----[Cell 1-] ----+
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[T3 (ID)] ------------------+ (resistor to B-)
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[T2 (Thermistor)] -----[NTC]----+
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[B-]
Tools needed: Multimeter (DC volts, Ohms mode) Do not connect B+ directly to the ID or T pins
If T1 to T5 reads 0V, the battery’s internal protection (BMS) has shut off due to over-discharge or short circuit. A Hart charger can reset it. Important Compatibility Note: While Hart, Ryobi, and Ridgid