Charger Yonli Q1

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This is a single cell USB powered charger with 3 current settings.

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The charger comes in a cardboard box with specifications on it.

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The box contained the charger, a USB cable and a instruction sheet.

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The charger is powered from a micro USB connector.

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There is a couple of leds on the charger and a single button.
Press the button to change LiIon charge current.

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Leds during charge, the four % leds are animated.

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The charger has specifications on the back, but they are not easy readable.

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The battery slot is the standard slide construction. That works from 33mm to 75.3mm, this is basically all battery sizes.

supportedBatteryTypes

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The charger can handle 75 mm long batteries including flat top cells.



Measurements


LiIon charging

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The charger uses some sort of CC/CV charge curve, but it do never really terminate charging.

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Same curve as above, but with input current added.

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These batteries are similar. It looks like the current regulation has a tendency to go into oscillations when it reduces the current, it do not affect the charge.

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Again the curves are similar and there is no real termination.

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It is similar with lower charge current.

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This 14500 battery gets completely filled and more.

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The same for this old and worn down cell.

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At 2A the charger starts at 2A, but the charge current is not maintained.

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Simulating a long cable or weak charger with a 0.5ohm resistor did not prevent the charger from working.

Temp7250

M1: 35.4C, M2: 41.7C, M3: 44.9C, HS1: 54.0C

Temp7252

HS1: 59.4C

PoweronLiIon

The charger is fairly slow to start.

CurrentChangeLiIon

The charge current can be changed at any time.

Unpowered%20voltage%20sweep

The charger will drain about 4mA from a LiIon battery, until it is down to 2.5V

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The charger has no problems with an unstable supply, it recovers nicely.



NiMH charging

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It looks like NiMH charging is some sort of constant voltage charging. In this case it works fairly well. The 1A charge current is rather low at 0.5A

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With this older cell it do not work at all.

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With these two batteries is works.

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There is no difference between the 0.5A and 1A current setting, charger always uses 0.5A for NiMH.

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The same with the AAA cell.

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And also with a full cell.

Temp7276

M1: 30.9C, HS1: 34.9C

PoweronNiMH

The charger is slightly slower to power on with NiMH, but still fairly fast. It uses pulsing charging.

ChargeNiMH1A

1A charge current selected, the current is 0.5A. This is a never battery than above and the current variation is smaller.

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Again it handles unstable power nicely.




Conclusion

This is not a very good charger with no termination, a strange NiMH charge algorithm, display not showing correct charge current. It has some good features: It will work with a 5V solar panel and it can charge very old batteries other chargers refuses to charge.



Notes

Here is an explanation on how I did the above charge curves: How do I test a charger