Typical USB phone path: try 80–95. Lower if cable/adapter is weak or device is hot.
Idealized estimate: capacity (mAh) ÷ (average charge current in mA × efficiency %). Not a lab measurement.
Typical USB phone path: try 80–95. Lower if cable/adapter is weak or device is hot.
Time in hours ≈ mAh ÷ (mA × efficiency ÷ 100) with positive capacity and charge current. Efficiency defaults to 85% if missing/invalid, capped at 100%. This is a simplified constant‑current style estimate; CV taper, temperature, and chemistry are not modeled.
Time in hours ≈ mAh ÷ (mA × efficiency ÷ 100) with positive capacity and charge current.