2.1A Dual USB car charger
Official specifications:
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Input Voltage: DC12V-24V
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Output Voltage: 5V
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Output Current: 2.1A/1A
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Material: Aluminum Alloy.
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Size: 6x6x2.5cm.
I got it from Aliexpress dealer: Maintain_Your_Car Store
It arrived in a plastic bag inside a envelope, no instruction sheet included.
Measurements
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USB outputs are coded as usb charger (DCP)
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USB outputs are in parallel.
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There is blue light inside the charger.
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Weight: 19.2g
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Length: 68mm
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Diameter: 25.7mm
For a 2.1A rated output it is rather weak with overload limit at 0.9A
Slightly higher voltage did not help
With 24V input I got slightly above the 0.9A, but not for long and it did not work after that. This means no more tests.
Tear down
I could remove the front with a spudger and then pull the circuit board out.
The circuit has two capacitors, a rectifier diode, a inductor and a chip (AD85063: 5V 1A)
The reason the circuit stopped working is obvious, the chip could not really deliver the rated current and was low on protection.
There is nothing on the bottom.
Being a 12V device there is no need to test with high voltages.
Conclusion
This charger is over rated and the chip cannot handle overload, this is a rather bad charger.
Notes
Read more about how I test USB power supplies/charger
Compare car chargers and other DC supplied chargers