Charger Enova All-21

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Enova has a long line of chargers with 2, 4 and 8 channels. This review is about one of the 2 channel chargers.

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I got the charger without any box.

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The charger has a mains input and a 12 volt input.

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There is also a usb output.

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The label on the charger says 4.22 volt, this is slightly to high for LiIon.
Charging a 10440 with 0.5A is not recommended (except for IMR types).

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There is 3 leds to show charge state.

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The battery slots are the usual construction and works acceptable.
It can handle batteries from 30mm to 69.8mm, this will give problems with some protected 26650 batteries.

supportedBatteryTypes

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The charger can handle 69.8 mm long batteries including flat top cells.
The current is too high for small cells.



Measurements


LiIon charge

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The charger uses a simulated CC/CV charge profile with a 70mA termination.

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The other channel works the same way.

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The two other batteries does also charge fine.

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My old 16340 cell is handled without any problems.

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Same with the two other cells.

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The charger will use full charge speed with two batteries.

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The charger needs about 500mA when powered from 12V

Temp1325

M1: 33,0C, M2: 33,4C, M3: 45,9C, M4: 49,3C, M5: 48,1C, HS1: 55,0C
The batteries stays fairly cool during charge.

StartupLiIon

The charger starts in about 4 second.

ChargeLiIon



NiMH charge

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This charger terminates on voltage and the charged capacity is slightly low.

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Both channels works the same way.

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Both EneloopXX and powerex will also termination on voltage.

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Same with the AAA cell.

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Using a voltage termination the charger is very fast to terminate on a full cell, here it is done in 3 minutes.

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No problem with two batteries.

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For charging NiMH it needs about 300mA from a 12V power supply.

Temp1336


M1: 35,5C, M2: 35,9C, M3: 44,8C, M4: 45,6C, M5: 45,1C, HS1: 51,6C


StartupNiMH

NiMH also starts in 4 seconds.

ChargeNiMH

NiMH uses measuring pauses.




LiIon & NiMH mixed charge

The charger supports charging a mix of NiMH and LiIon batteries at the same time.

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The NiMH takes the same time to charge as above.

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As can be seen in the current curve there is a slight change in current when the NiMH finish.



USB output



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The usb output is rated for 0.7A with one battery and can deliver a bit above 1A with one battery, this looks fine but I would have liked a overload protection.
There is a minor difference in maximum current between the two channels.

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With two batteries it is rated for 1A and can deliver 2A.

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Output looks fine with 0.5A load. It limits the battery discharge to about 2.75 volt, but does not turn the output off.

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Different battery capacity will, of course, give different runtimes.

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Using two batteries will double the runtime. Because the two usb output circuit are slightly different, it will drain one battery first, then the other battery.
The efficiency curve is not corrent, because I only measure current for one battery.

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Increasing the current to 1A with one battery does not work perfectly, output will drop to early.

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It works better with two batteries, but still not perfect. When the first battery is empty it has trouble maintaining output.


10ohm

The noise is very low on the usb output: 4.8mV rms and 66mVpp

5ohm

It does increase slightly with higher load (1A): 8.5mV rms and 76mVpp (With two batteries the Vpp is 90mVpp),


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



Conclusion

The charger is a good LiIon charger, with NiMH batteries it will be slightly below full charge because it uses voltage termination without any top-off charge.
The usb output is acceptable. It has low noise and can deliver 1A with two batteries. The termination is not very good and I am missing a indication when output is on and overload protection.



Notes

The charger was supplied by Enova for a review.

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

Read more about how I test USB power supplies and chargers