Charger EverActive NC1000 plus

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This is a compact 4 channel analyzing NiMH charger and usb charger from everActive.

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I got the charger in a cardboard box with a lot of specification on in 3 languages

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The box contains the charger, a power supply, a car adapter and a manual.

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The charger has a barrel connector for 12V power input, but this charger can also charge usb devices and has a usb connector for that.

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As all analyzing charger it has a display and a couple of buttons.

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Selftest during powerup shows all the text on the display.

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When working the display looks like this, the DISPLAY button can be used to select what to show (V/h/mA/mAh).
The MODE button is used to select mode for one or for all slots, it is also possible to change mode later on.
The CURRENT button will step between the possible currents, this only works when new batteries are put in or after using the MODE button.
Using the MODE and CURRENT button will change for all channels, but if one of the numbers is pressed first only that channel is changed.

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The charger uses a AA/AAA two level slot.

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Measurements


Charge

The charge mode can select between 200, 500, 700 and 1000, default is 500mA.

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This charging looks fairly good with -dv/dt termination, but it has some tricke charge.
Display shows 1950mAh in 2:47

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The 3. other channels also looks good.

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At 0.2A the current is too low to do -dv/dt termination, but the charger stops anyway, maybe on a timer. The battery is not fully charged, but that is basically my own fault for selected way to low charge current for that battery.
Display shows 1722mAh in 8:36


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At 1A the -dv/dt works perfectly. The trickle charge do not stop within the first 3 hours (probably never).
Display shows 1950mAh in 1:57

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Display shows 2.55 Ah in 2:33

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The two high capacity cells looks fine.

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This cell is definitly not new anymore, it has a fairly high internal resistance, but the charger handles it.
Display shows 2.06 Ah in 2:03

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No problems with the AAA cell.
Display shows 712mAh in 1:25

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The full cell is detected fairly fast for a -dv/dt charger.
Display shows 102mAh in 0:06

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Four cells at 1A is not a problem.
The display shows 1947mAh 1927mAh 1935mAh 1969mAh

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The charger uses below 1A for this.

Temp3370

M1: 41,8C, M2: 44,4C, M3: 44,8C, M4: 42,4C, HS1: 52,3C
Beign a compact charger the batteries are fairly warm during charging.

PowerOn

When turned on the charger will wait some time for user input, before start charging.

Charge0.2A

The charger uses pwm to regulate the current, here with minimum charge current.

Charge1A

And here with maximum charge current.

Charge1AnearlyFull

This chart has higher battery voltage than the chart above, but current and duty cycle is the same, i.e. the charge current is regulated and not depend on the battery voltage.

ChargeTrickle

Trickle charge is done with short pulses, this works out to 46mA average current.



Discharge

The discharge mode can select between 100, 250, 350, and 500mA, default is 250mA

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The battery is discharged to 0.9 volt.
Display shows 1993mAh in 3:55

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Display shows 2.09Ah in 0:59

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Display shows 1999mAh in 5:42

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Display shows 2.06mAh 2.08mAh 2.06mAh 2.07mAh

Temp3373

M1: 39,3C, M2: 41,8C, M3: 43,1C, M4: 42,1C, HS1: 55,4C
When discharging the charger need to get rid of the energy, this will heat the batteries.

Discharge0.1A

Dishcharge is also regulated with pwm, here at lowest discharge current.

Discharge0.5A

And at highest discharge current.

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Using a battery with higher voltage will change the pwm and the current, i.e. discharge do not use constant current.

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On the scope pictures above a strange pulse can be seen, I do know the reason for this pulse.



Discharge Refresh

This function will cycle the cell a couple of times, it finish with a charged cell, the selected current is discharge current.

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Display shows 2.12Ah in 4:11


Charge Test

This function will charge the battery, then discharge the battery, the display will show the discharged capacity. The selected current is the charge current, the discharge current will be half that.

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Display shows 2.10Ah


USB output


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The usb output cannot deliver the rated 1A, but only about 0.95A and the efficiency is low.

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Charging battery at the same time usb output is used is no problem. The efficiency will, of course, be much worse because a lot of power is going to the batteries and not to the usb output.

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I run the one hour test at 0.9A and there was no problem. I did the test both without batteries and with 4 batteries charging at 1A.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

Temp3364

M1: 51,7C, M2: 39,2C, M3: 40,8C, HS1: 54,3C
The charge do not get very warm as a usb power supply, but this is fairly warm if there is batteries in it.

Temp3365

M1: 42,4C, M2: 39,2C, HS1: 51,8C

Temp3366

HS1: 49,2C

Temp3367

M1: 50,8C, M2: 51,0C, M3: 47,5C, M4: 44,8C, HS1: 58,1C
The batteries get fairly warm when charged together with usb output working at full power.

Temp3368

M1: 50,5C, M2: 42,7C, HS1: 60,2C

10ohm

Noise it very low at 18mV rms and 154mVpp.

6ohm

Noise it also very low at full power at 16mV rms and 113mVpp.
If the charger is also charging batteries there will be more noise, but still in the very good range.



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



Conclusion

This is a compact analyzing charger and this means it will run a bit on the warm side when using full current. The trickle charge current is on the high side, this means it is best to remove batteries fairly soon after the are charged.

All functions works as expected, the user interface is easy to use and it was not early or late on a single termination (Except when provoked), this makes it a good NiMH charger.

As for the usb charger function it has some issues, it works and has low noise, but the coding is wrong and below 1A is not very good.



Notes

The charger is from Amazon.de with help from a reader.

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