Skilhunt M1

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Skilhunt usual sells flashlights, but has recently started on chargers. This charger is a universal 1 channel charger that can handle multiple chemistries and battery sizes. It does also work as a power bank.

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I got the charger in a cardboard box with specifications on it.

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The pack contained the charger, a usb cable and a instruction sheet.

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The charger is powered from micro usb and has a full size usb connector for power bank output.

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The charger has two red leds to show selected current and four blue leds in a row to select voltage and show battery level.
The button has multiple functions:
When a battery is put into a powered charger, it can be used to select LiIon voltage (NiMH is selected automatic).
When charger is powered a long press (2 seconds) will change between 0.5A and 1A charge current.
A fast click when charging will show the selected battery type.
When used as a power bank a press on the button will turn the usb power on.

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The charger uses the typical slider construction, it can handle batteries from 33mm to 70mm.

supportedBatteryTypes

supportedBatterySizes DSC_2894 DSC_2895 DSC_2896

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The charger can handle 70mm long batteries, inclusive flat top cells, this means most protected cells.



Measurements charger


Charging 4.20 volt LiIon

Skilhunt%20M1%201A%20(PA18650-31)

The charger has a fine CC/CV voltage charge curve, it starts reducing current a bit early, due to voltage constrains, this will give slightly longer charge time.

Skilhunt%20M1%201A%20(SA18650-26)

Skilhunt%20M1%201A%20(PA18650-34)

No surprise on these two cells.

Skilhunt%20M1%200.5A%20(PA18650-31)

Reducing the charge current to 0.5A works fine, except the termination current is not reduced (Cells will miss the last few percent of the charge).

Skilhunt%20M1%201A%20(BE18650-26)

With this older cell the current reduction starts very early as expected.

Skilhunt%20M1%200.5A%20(AW18350-IMR)

Skilhunt%20M1%200.5A%20(KP14500-08)

Good charging on these smaller cell, again the higher termination current means a few percent loss in capacity.

Skilhunt%20M1%201A%200.5ohm%20(PA18650-31)

Adding a resistor in series with the usb power supply to simulate a long cable or weak supply did not prevent the charger from doing a good job, but it needed some more time.

Temp2786

M1: 35,1C, M2: 37,7C, M3: 44,4C, HS1: 48,3C

Temp2787

M1: 34,4C, M2: 35,0C, M3: 38,6C, HS1: 50,5C

PoweronLiIon

The charger needs some time to start up, this is because it is waiting for voltage selection.

CurrentChangeLiIon

There is no problem with changing current while charging.



Charging 4.35 volt LiIon

Skilhunt%20M1%201A%20(LG18650-30)

The 4.35 volt charge works as expected.



Charging 3.60 volt LiIon

Skilhunt%20M1%201A%20(18650-LiFePO4)

Skilhunt%20M1%200.5A%20(Soshine-LiFePO4)


Both LiFePO4 cells is charged fine, but the voltage is a bit high (This is not a big problem with LiFePO4).



Charging NiMH

Skilhunt%20M1%201A%20(eneloop)

This is a good NiMH charge with -dv/dt termination and no trickle charge.

Skilhunt%20M1%200.5A%20(eneloop)

Using 0.5A charge current the -dv/dt signal is nearly gone, but the charger do termination when the battery is full.

Skilhunt%20M1%201A%20(eneloopXX)

On this cell it looks like a voltage termination.

Skilhunt%20M1%201A%20(eneloopPro)

Here it is again a -dv/dt termination.

Skilhunt%20M1%201A%20(powerex)

This cell is nearly hopeless to termination on, but the charger did stop.

Skilhunt%20M1%200.5A%20(eneloopAAA)

The AAA cell is stopped on voltage.

Skilhunt%20M1%201A%20full%20(eneloop)

Fast detection of a full cell, this is voltage termination.

Temp2793

M1: 33,7C, M2: 40,0C, M3: 31,9C, HS1: 49,6C

PowerOnNiMH

The charger is also slow to start with NiMH, but it is not possible to select any other battery type.

CurrentChangeNiMH

There is no problem with changing current while charging. The charger uses the typical pulsing, where it can measure voltage with current off.



Power bank

Skilhunt%20M1%20(PA18650-31)%20load%20sweep

USB output can deliver 1.3A before it starts dropping, the overload protection first kicks in at 2A.

Skilhunt%20M1%20(PA18650-31)%20usb%20out%20%2010ohm

Running with 0.5A load looks very good.

Skilhunt%20M1%20(PA18650-31)%20usb%20out%20%205ohm

Increasing to 1A do have some problems the last 5 minutes, but generally works fine.

10ohm

The noise is fairly good at 0.5A load with 21mV rms and 200mVpp

5ohm

At 1A the noise increases, but is still acceptable with: 40mV rms and 310mVpp



Conclusion

The charger is not perfect, it has a few small issues, but nothing serious with any of the functions.

This makes it a good charger for all supported batteries and also a good power bank.



Notes

The charger was supplied by Skillhunt for a review.

Here is an explanation on how I did the above charge curves: How do I test a charger
Read more about how I test USB power supplies/charger