Test Setup
To understand real wireless charging efficiency, we conducted controlled lab testing.
Test variables included:
- smartphone battery capacity
- wireless power bank output
- alignment conditions
- charging duration
- temperature control
All tests were performed under stable environmental conditions to ensure consistency.
Test Results
| Scenario | Efficiency |
|---|---|
| Perfect alignment | ~60% |
| Normal daily use | ~55% |
| Misalignment | 45–50% |
What These Numbers Actually Mean
Most wireless chargers are marketed based on peak output power.
But users don’t experience peak power —
they experience average efficiency.
And that’s where the gap is.
Energy Loss Breakdown
Caption：
Energy loss across the wireless charging transmission chain.
Where the Energy Is Lost
Energy loss mainly occurs in:
- wireless transmission
- heat dissipation
- voltage conversion
- coil inefficiency
Each stage introduces small losses —
combined, they become significant.
Real Charging Performance
Even with a 15W wireless charger:
- sustained power is typically 7–10W
- charging slows as temperature increases
- alignment directly affects performance
Why Efficiency Drops in Daily Use
In real use, efficiency is affected by:
- device movement
- heat buildup
- imperfect alignment
- background power consumption
This is why users often feel:
“It’s charging, but not really charging.”
Key Takeaway
Wireless power banks typically deliver:
55–60% of stored energy to the phone battery
This is normal behavior, not a product issue.
👉 wireless charging power curve
👉 wireless charging efficiency map
👉 real 15W wireless charging speed
Source: Reachinno Wireless Charging Lab
