Calculate Charging Time: How Long Does Your Battery Take?

If you want to quickly and reliably determine the charging time of your Li-Ion, Ni-MH, or Ni-Cd battery, you’re in the right place. With Golisi’s charging time calculator, you get an accurate estimate based on capacity, charging current, and charging efficiency – perfect for applications in photography/video, camping, DIY, lighting, e-mobility, and more.

Golisi stands for certified quality, durable materials, and safe charging performance in Germany, Austria, and Switzerland. Use the calculator to optimize your energy planning and find the right charger from our range.

GOLISI Charging Time Calculator

mAh / mA · Real-time

Formula: Charging time ≈ Capacity / (Charge current × Efficiency)

Quick Selection: Charger Series mainly sets the charging current (mA)

Note: Efficiency is set to 85% by default. You can adjust it below if needed.

Capacity (mAh)

Charge Current (mA)

Charger Efficiency 85%

Start SoC (%) Target SoC (%)

Tip: For an 80% charge, set Target SoC to 80.

Charging Time: 0 h 0 min (0 minutes)

Approximate value. Depends on cell chemistry, temperature, balancing & age.

Example 18650

3000 mAh · 2 A · 85% ⇒ approx. 1 h 46 min

Category 18650

Example 21700

5000 mAh · 2 A · 85% ⇒ approx. 2 h 56 min

Category 21700

Example AA

2000 mAh · 1 A · 85% ⇒ approx. 2 h 21 min

Category AA