Eizfan Pro Q2 Intelligent Charger

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This is a simple LiIon charger for two cells.

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The cardboard box lists some specifications, battery types and features.

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The box contains the charger, a mains cable and, manual.

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The charger has a socket mains input, it will accept 100-240VAC 50/60Hz according to specifications.

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There is not much user interface on this charger, only one led for each slot. It is red while charging and green at other times, except if a totally drained battery is put into the charger, then it will go out.

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Specifications are listed on the back.

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The slots uses the usual slider construction. They can handle batteries from 29mm to 70.3 mm long, this excludes protected and button top 21700 and a few very long protected xx650 batteries, but everything else will fit in length.

supportedBatteryTypes

supportedBatterySizes DSC_5205 DSC_5206 DSC_5207 DSC_5208


Due to the 1A charge current it is best only to charger high current version of small cells in the charger.
The charger slots are large enough to fit 32650 batteries, but I had trouble getting connection with them.
The charger can handle 70 mm long batteries, inclusive flat top cells.



Measurements

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A nice CC/CV charge curve with a termination current around 130mA.

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The second slot is similar.

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Eizfan%20Pro%20Q2%20%28PA18650-31%29%20%231
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Eizfan%20Pro%20Q2%20%28AP18650-26%29%20%231

Other types of batteries do not change anything.

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Here I am a bit nasty with the charger, trying to charge a old worn down cell. It has high enough voltage drop that the voltage gets under the restart voltage and the charger cycles the on/off a couple of time.

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With two batteries the charge current drops a bit, this is probably due to the temperature inside the charger.

Temp6474

M1: 40.3C, M2: 41.9C, M3: 53.8C, HS1: 63.0C

Temp6475

HS1: 54.4C

PoweronLiIon

The charger is fairly fast to start, only requiring about 1 second.


Testing with 2830 volt and 4242 volt between mains and low volt side, did not show any safety problems.



Conclusion

It is a simple charger, but for LiIon batteries that can handle 1A charge current it works fine and with acceptable charge speed.



Notes

The charger was supplied by a Eizfan (Efan) for review.

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