Wireless charger over-temp protection typically triggers between 65–75°C. Phone and earbud thresholds may differ. Thermal chamber tested from -20°C to 80°C. Real test data below.
Ever Had Charging Suddenly Stop?
You put your phone on the charger. Come back later. It didn't charge.
Most likely — over-temp protection kicked in.
Wireless charging generates heat. Normally fine. But a hot car in summer, a nightstand under a blanket, a desk with no airflow — these can push temps too high.
It's not broken. It's designed to stop. To protect your device and battery.
Industry Typical Over-Temp Thresholds
We reviewed protection mechanisms on mainstream wireless chargers. Here's the reference range:
Note: Thresholds vary by brand and power. High-power fast chargers typically have higher thresholds.
Our Test Data (-20°C to 80°C)
We tested a commercial 7-in-1 magnetic charging station in a thermal chamber:
Our test process has two steps:
1. Thermal test: Unit placed in chamber at -20°C and 80°C for 2 hours each (no charging during this step)
2.Function test: Unit removed, returned to room temperature, then plugged in to test all charging functions
Pass criteria: All charging pads work normally in step 2.
Test conclusions:
· Phone stop threshold: 75°C
· Earbuds stop threshold: 70°C
· Low-temp limit: works at -20°C
Why Different Thresholds for Phone and Earbuds?
Earbuds have tighter internal components and worse heat dissipation. They're more temperature-sensitive. That's why earbud thresholds are usually 5–10°C lower than phone thresholds.
Explains why sometimes your phone keeps charging but the earbud pad stops.
FAQ：
Q: Charging stopped suddenly. How do I know if it's over-temp?
A: Feel the charger and device. If it's too hot to hold (estimated 60°C+), it's likely over-temp protection. Unplug, move to cool area for 10–15 minutes, then try again. If it works, protection is functioning normally.
Q: 75°C seems high. Isn't that dangerous?
A: 75°C is internal charger temperature, not case temp. Internal coils and MOSFETs can handle this short-term. Case temp runs 15–20°C cooler. Higher threshold prevents false triggers in normal hot conditions.
Q: Can I leave it in a hot car?
A: A car in summer can reach 60–70°C. Most chargers still work in this range, but near protection boundaries. Forgetting once is fine. Daily long-term? Not recommended.
Q: Does it work at -20°C?
A: Yes. Cold doesn't trigger protection. Cold start works fine. Tested stable at -20°C.
Which product did we test?
The data above comes from thermal chamber testing of THL MagCharge 7-in-1.
Want to know your charger's protection threshold? Check the spec sheet. Or test it in a hot environment (safely).
