Charger Panasonic BQ-CC18

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Panasonic has a line of NiMH chargers, some are fast and smart, others dumb. This one here is a very slow and very dumb charger.
I found this charger on ebay from akkuland.

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I got the charger in a blister pack. There was no extras, only the charger and a instruction sheet.
The instruction sheet specifies charge time for different cell capacities, from 5 hours for a 1000mAh AA to 12 hours for a 2500mAh AA.

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The charger is designed with a foldable US plug.

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But when sold in EU a EU plug is clicked on above it.

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The only user interface is two leds, one for slot #1 & #2 and one for slot #3 & #4, i.e. the charger can only charge two or four batteries at a time.
The leds is green while charging and will flash on error. When charging is done they turn off.

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

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Measurements charger


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The two cells is fully charged and a bit more, using about 12.5 hours. This looks like the charger uses a fixed charge time.

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There is no surprise with the second channel, it uses exactly the same time.

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The charge time is long enough to fill higher capacity cells and also over charge them a bit.

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Charging AAA cells will reduce the current and use the same time.


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Four batteries do also take 12.5 hours to charge.

Temp2744

M1: 34,8C, M2: 37,1C, M3: 38,2C, M4: 34,3C, M5: 38,8C, HS1: 51,0C


Temp2752

M1: 42,4C, M2: 46,1C, M3: 46,2C, M4: 41,4C, M5: 38,4C, HS1: 51,2C
When the batteries are full they will get rid of the extra energy as heat.

Startup

The charger start fast. I wonder about the pulsing, the charger do not measure any voltage to terminate the charging.

Charge4

The first chart was with two cells, here I tries with four cell, it looks exactly the same, i.e. no time division of a single charge circuit, the charger has two charge circuits.

ChargeAAA

With AAA the current is reduced.

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



Conclusion

This charger do always need 13 hours before it says done, the manual recommends to unplug the charger after the specified charge times for the different cell capacities.
It is not a good idea to charge full or half depleted batteries on this charger, it is best to charge only empty batteries.
I do generally not like this type of charger, it is hard on the batteries, because it always overcharge, but it may charge old mostly worn out batteries.



Notes

This charger looks like a slightly cheaper version of the BQ-CC51

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