Charger Panasonic BQ-CC16

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Panasonic has a line of NiMH chargers, some are fast and smart, others dump. This one here is a fast and smart charger.

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I got the charger in a blister pack. In addition to the charger there was eneloop pro cells.

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The makes the total contents: The charger, 4 eneloop pro cells and a instruction sheet in many languages.

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The charger is designed with a US power plug but includes a EU plug. The EU plug requires tools to remove.

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With the US plug the plug can be folded into the charger, but not with the EU plug.

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The charger has four hidden leds to show when it is charging. With only two batteries in the charger only two leds will be on.
This charger does not use the typical red/green led, but only green led and green means charging.

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The charger has the typically two level slots used for AA and AAA batteries.

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The AAA batteries are not locked very hard into place.

supportedBatteryTypes

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Measurements charger


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The charge looks like voltage termination, but it does fill the battery (Temperature increases) and supplement with a two hour top-off charge.

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All channels looks the same.

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The XX also looks the same.

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The pro cell (The one supplied with the charger) uses a -dv/dt termination and has a rather large temperature increase.

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I wonder what the powerex terminates on, it is missing the temperature increase that signals a full cell.
But the charger has nearly filled the cell, not much capacity is missing.

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The AAA must be a voltage termination. The charger current is reduced for this smaller cell.

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With the full eneloop it looks like a -dv/dt termination and a top-off charge.

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With 4 cells in the charger the current is reduced.

Temp1375

M1: 36,5C, M2: 40,4C, M3: 42,8C, M4: 41,7C, M5: 53,9C, M6: 30,5C, HS1: 60,2C
The temperature is fairly normal for this type of compact charger.

Temp1374

M1: 36,1C, M2: 40,1C, M3: 43,3C, M4: 41,8C, M5: 50,5C, HS1: 53,9C

Startup

The charger needs about 3 seconds to start.

Charge1cell

The charger is using pulsing current. The current in the pulses is about 2.2A and is independent of battery voltage.

Charge3cell

With 3 or 4 batteries in the charger the pulse pattern is changed. The pulse is always the same but the charger will use 2 or 4 phases depending on the number of batteries.

Charge1AAA

With AAA the current is reduced, but the pulse pattern is the same.


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



Conclusion

The charger is very good at filling the eneloop batteries. The two hour top off charge helps filling batteries if the charge terminates slightly early. No trickle charge is an advantage for LSD cells.
I would have preferred a lower charge current for more time, instead of the high current pulses, the pulses may give problems with some old cells.

I believe this is a good NiMH charger.



Notes

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