Charger Basen BO-4

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This is a fairly simple quad cell LiIon charger from Basen.

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It arrived in a cardboard box with a lot of specification 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 usb powered with a micro usb input.

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There is only one button and a couple of leds. The button will change selected current, default is 0.5A.

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During power on all the leds will shortly turn on. During charge the blue leds are animated and only one green led is on.

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The specifications are on the bottom of the charger, but rather hard to read.

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The charger uses the classic slider construction and will handle batteries from 28mm to 70.4mm, this will give problem with the longest protected cells.

supportedBatteryTypes

supportedBatterySizes DSC_8701 DSC_8702 DSC_8703
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The charger can handle up to 70mm long batteries,



Measurements

Basen%20BO-4%201A%20%28SA18650-33%29%20%231

Nice CC/CV charge curve with a 70mA termination current

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Oops, the charger voltage is way to high on this slot.

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The two last slots looks fine enough.

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Basen%20BO-4%201A%20%28PA18650-31%29%20%231

These two cells looks fine.

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Even the old cell is charged fine.

Basen%20BO-4%200.5A%20%28SA18650-33%29%20%231
Basen%20BO-4%200.5A%20%28KP14500-08%29%20%231

No problem with 0.5A charging current.

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This old and worn out cells drops significantly in voltage when charging terminates and the charger restart.

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I have selected 2A charging current and with one cell in the charger the current is 2A.

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This high current cells looks about the same during charging.

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With two cells it will only be 1A

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And with four cells 0.5A

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Adding 0.5ohm resistance in series with the power supply to simulate a long cable or weak supply shows that the charger will reduce usb and charge current, but the charging works fine.

Temp5296
M1: 31.2C, M2: 32.5C, M3: 31.9C, M4: 30.4C, M5: 33.9C, M6: 39.6C, HS1: 44.5C

Temp5296
HS1: 47.4C

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Being a fairly simple charger I could draw the current profile.

Poweron

The charger is very fast to start, it needs less than a second.

CurrentChange

It is possible to change current at any time.



Conclusion

I like the simple user interface, it is very easy to select current and see how much the batteries are charged. The CC/CV charge curve is good and termination is at a fairly low current

But slot #2 is problematic with the high charge voltage and for this reason I will only give the charge an acceptable rating.



Notes

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