Charger Ioncell BC0907C

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I do not know much about the "Ioncell" brand, except I have tested a Ioncell usb power supply before. This charger is a simple 4 channel NiMH charger with discharge/refresh ability. I found this charger on ebay.

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The box has a lot of specifications on it (Click the picture for a larger version).

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Inside the box is the charger, a universal power supply (100-240VAC 50/60Hz) with US plug, a adapter plug and a manual.

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The charger has a simple LCD display with a very nice blue background light.
The background light is on while the charger is working.

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To trigger the discharger/refresh cycle, the "Refresh" button must be pressed. This will start a refresh on all channels.

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The charger have separate connections points for minus on AA and AAA batteries, this way it can select different charge currents.

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The marking of each slot is good.

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Measurements


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The charging looks nice, with a -dv/dt termination, but the trickle charging is a bit high at 100mA.
The 100mA is acceptable for non LSD (Low self Discharge also sometimes called precharged) NiMH, but not for LSD.

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Not much difference to the other channels.

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The XX takes a bit longer to charge.

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With AAA cells the charger current is reduced to around 400mA, but the trickle charge is still 100mA.

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Pressing the "refresh" button will start a cycle, first the battery is discharged and then it is charged.
It takes about 7 hours to do four 2000mAh batteries.

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A full battery takes about 10 minutes to detect.

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The charger uses the same charge current with four batteries in it, but it looks like the trickle current is reduced.

Temperature1
M1: 31,1C, M2: 33,1C, M3: 32,7C, M4: 31,8C, M5: 32,8C, HS1: 36,3C

Temperature
M1: 44,5C, M2: 41,6C, M3: 43,3C, M4: 40,6C, M5: 36,8C, HS1: 48,3C

The heating is fairly even for the batteries.

Startup

The charger does a fast startup at high current, then reduces the current.

Charging

The staircase steps is charge current is strange, but I cannot see any problems in it.


Testing with 2500 volt and 5000 volt between mains and low volt side, did not show any safety problems.



Conclusion

The charger does a nice charging job, but the high trickle current spoils it for LSD cells. I.e. either be quick to remove the batteries when the charger is finished, or use only non-LSD cells.
All in all a good charger (Except for the trickle current) and easy to use.



Notes

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