Review Charger Xtar X2

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A two slot LiIon and NiMH charge with automatic current selection and both mains and USB power input.

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The charger was in a cardboard with specifications on it.

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The box included the charger, a mains cable and a instruction sheet.

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The charger has input for both USB power and mains power input.

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There is a single button on the charger, it can be used to turn backlight on or restore backlight to full power.

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During power on all segments will be shown.

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No batteries in the charger.

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A LiIon and a NiMH battery.

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The charger has specifications on the back, with black text on black background.

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The connection are the common slider style that can handle from 31.5mm to 77.3mm, this means all batteries will fit.

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The slots are marked with current, but the marking leaves out the 0.5A current that is used with short batteries.

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The charge current is on the high side for 10440 batteries.



Measurements charger


Charging LiIon

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A single LiIon battery in slot #1 is charged with 2A using a CC/CV profile, termination current is around 100mA
Display shows 3154mAh

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In slot #2 the charge current is 1A.
Display shows 3035mAh

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Display shows 1950mAh

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Display shows 2599mAh

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Charging other LiIon batteries in slot #2 works nicely.
Display shows1950mAh

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A high current battery can be charged in slot #1.
Display shows 2902mAh

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A short LiIon battery can also be charged in slot #1, due to the shorted length the charger will use 0.5A charge current.
Display shows 572mAh

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With two long batteries both slots are limited to 1A charge current.
Display shows 2927mAh 2942mAh

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This is valid for both USB and mains power state.
Display shows 2926mah 3015mAh

Temp7671

M1: 37.9C, M2: 38.0C, M3: 41.2C, HS1: 47.3C

Temp7673

M1: 39.9C, HS1: 43.6C

PoweronLiIon

The charger needs about 6 seconds to turn on.

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The charger will discharge a full LiIon battery with about 3.5mA.

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Charge profile, the charger always start with a low current when voltage is below 2.7V.

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The charger cannot work with an unstable USB supply.



Charging NiMH

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The charger uses a good -dv/dt termination followed by a two hour top off charge.
Display shows 1989mAh

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The other slot is similar
Display shows 1834mAh

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The old pro cell get some capacity and terminates.
Display shows 380mAh

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This high capacity cell is charged nicely.
Display shows 2399mAh

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With the leise the termination is on the slow side, but it do terminate.
Display shows 2970mAh

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The AAA cell is charged with the same current as the AA cells, here the 0.8A is a bit on the high side.
Display shows 715mAh

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Due to the low current startup it takes the charger about 15 minutes to detect a full cell.
Display shows66mAh

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Two cells are charged at the same speed as one.
Display shows 1858mAh 1878mAh

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This also goes for USB.
Display shows 1880mAh 1840mAh

Temp7691

M1: 40.5C, M2: 40.3C, HS1: 50.2C

PoweronNiMH

The charger uses the same time as for LiIon, before it starts on the precharge.

ChargingNiMH

As usual the NiMH charging is pulsing, this makes it possible to check the voltage with current off.

Top-Off-Charge

Top-off charge 1s at 1A every 20s or an average of 50mA.

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The charger handled unstable voltage considerable better with NiMH cells.



Testing with 2830 volt and 4242 volt between mains and low volt side, did not show any safety problems.




Conclusion

This charger works fine for both LiIon and NiMH, there are a few issues, but nothing serious.

I will rate it as a good charge.




Notes

The charger was supplied by a Xtar for review.

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