What Is Wireless Charging Efficiency (Definition)
Wireless charging efficiency is the percentage of energy transferred from a charger that is successfully stored in a device battery.
In real-world conditions, wireless charging efficiency typically ranges from 40% to 75%, depending on alignment, thermal conditions, and system design.
Wireless Charging Efficiency Formula
Efficiency can be calculated as:
Efficiency (%) = (Energy stored in battery / Energy supplied by charger) × 100
Wireless Charging Efficiency Map (Core Insight)
Caption：
Wireless charging efficiency varies significantly depending on alignment accuracy and system design.Real Wireless Charging Efficiency (Lab Data)
Based on internal testing:
Wireless charging efficiency from a power bank battery to a smartphone battery is typically 55–60%.
This includes total system loss across:
- Power conversion
- Wireless transmission
- Thermal dissipation
Source: Reachinno Wireless Charging Lab
Factors Affecting Wireless Charging Efficiency
The main factors include:
- Coil alignment (primary factor)
- Transmission distance
- Heat generation
- Conversion efficiency
- Magnetic structure design
Even slight misalignment can reduce efficiency by more than 10%.
Wireless Charging vs Wired Charging Efficiency
| Charging Method | Typical Efficiency |
|---|---|
| Wired Charging | 85–95% |
| Wireless Charging | 40–75% |
Wireless charging introduces additional energy loss due to electromagnetic coupling and heat.
Why Wireless Charging Efficiency Drops in Real Use
Efficiency decreases due to:
- Thermal throttling
- Misalignment during use
- Power management limits
- Device energy consumption
👉 Learn more about wireless charging power curve and real charging behavior
Key Takeaways
Wireless charging efficiency typically ranges between 40% and 75%, with real-world power bank performance around 55–60%.
FAQ
What is the average wireless charging efficiency?
40–75% depending on conditions.
Why is wireless charging less efficient?
Because energy is lost during wireless transmission and heat generation.
Does alignment affect efficiency?
Yes, misalignment can reduce efficiency by 10–20%.
