Replying to @MakeItHackin

With NiMH batteries ≥2.8 V is fully charged, and it completely cut off around ~1.8 V. But I didn’t track the middle part. Based on the discharge curve, I sense that it’ll decline quickly to 2.6 V (80% charge), then slowly to 2.4 V (20% charge), then quickly again to 2 V (dead).