Test/review of Charger Basen BO-4

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HKJ
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Test/review of Charger Basen BO-4

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


  • Power consumption from usb when idle with no batteries is 13mA
  • Below 0.5V the charger will not detect a battery
  • Between 0.5 and 2.8V the charger will charge with low current
  • Above 2.8V the charger will use full current.
  • Will restart charging if voltage drops below 4.15V, but it may need some time to react.
  • Will restart charging if battery is inserted or power cycled.

Basen%20BO-4%201A%20%28SA18650-33%29%20%231
Nice CC/CV charge curve with a 70mA termination current
Basen%20BO-4%201A%20%28SA18650-33%29%20%232
Oops, the charger voltage is way to high on this slot.
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Basen%20BO-4%201A%20%28SA18650-33%29%20%234
The two last slots looks fine enough.
Basen%20BO-4%201A%20%28SA18650-26%29%20%231
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: 31.2°C, M2: 32.5°C, M3: 31.9°C, M4: 30.4°C, M5: 33.9°C, M6: 39.6°C, HS1: 44.5°C
Temp5296
HS1: 47.4°C
Voltage%20sweep%200-4.25V%202A
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

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/