Charger Xtar XP1

DSC_3425

Xtar made many good chargers, this is a new small charger. It has a single channel and can charger both LiIon and NiMH batteries up to AA size.

DSC_3420 DSC_3421
DSC_3422 DSC_3423

It comes in a cardboard box with specifications on the back.

DSC_3424

I got the charger, a manual and a usb cable.

DSC_3426

The control panel has 3 leds and one button:
2 Leds to show selected current (0.25A or 0.5A).
1 leds to show charge status for the batteries (red=charging, green=done or no batteries).
The button will select charge current, when power is connected and a long press will activate cycling with a NiMH (Not with LiIon).

DSC_3429

The power input is a micro usb connector, i.e. any usb power supply/charger can be used.

DSC_3427

Xtar has a special label on, that makes it possible to check for counterfeig chargers.

DSC_3431 DSC_3432

The charger can handle both button top and flat top batteries, from 31mm to 52.8 mm (i.e. from CR123 up to AA size). The slider works very smooth.

supportedBatteryTypes

supportedBatterySizes DSC_3434 DSC_3433


DSC_3435 DSC_3436 DSC_3437 DSC_3438 DSC_3439

The charger can handle 52.8 mm long batteries, including flat top cells. (See my Small LiIon comparison for length of different brands).



Measurements charger

Xtar%20XP1%200.5A%20(AW18350-IMR)

This charger has a very good CC/CV curve, the termination current is slightly high.

Xtar%20XP1%200.5A%20(AW16340-IMR)

My old 16340 is also charged fine.

Xtar%20XP1%200.25A%20(AW18350-IMR)

Xtar%20XP1%200.25A%20(AW16340-IMR)

250mA or 0.25A works just as good, just slower.

LiIonStartup

During startup the charger has a periode with low charge current, my guess it that it is used to detect battery type.

LiIonChangeTo500

Increase in charge current is done with a slow ramp.



NiMH batteries


Xtar%20XP1%200.5A%20(eneloop%20AA)

The charger does some pulsing while charging NiMH, it looks like the termination is a -DV termination.
When terminated the charger will trickle charge, this is a good idea with NiMH (But prohibited with LiIon)

Xtar%20XP1%200.25A%20(eneloop%20AA)

Using 0.25A charge current is not a good idea for AA batteries, the charger has problems detecting when it is done.

Xtar%20XP1%200.25A%20(eneloop%20AAA)

With AAA batteries at 0.25A charge current, the termination if detected earlier, but it is still not perfect.

Xtar%20XP1%200.5A%20(eneloop%20AA)%20full%20battery

It takes 60 minutes to detect a full AA battery at 0.5A, not very good.

Xtar%20XP1%200.5A%20refresh%20(eneloop%20AAA)

Holding the button down with a NiMH battery in the charger will start a refresh function, where the battery is first discharged, then charged.

Xtar%20XP1%200.25A%20refresh%20(eneloop%20AAA)

The current selection is not used during discharge, only during charge.

NiMHstartup

With a NiMH battery in the charger, it stays at the low current for about 2 minutes, before going to full charge current.

NiMHcharge

During NiMH charge it will stop charging each other second, this is probably done to check the voltage.


Conclusion

This charger does a good CC/CV charging on LiIon and with 2 current settings it can handle a wide varity of small cell sizes.
The NiMH charging has some problems with termination, making the termination a bit more sensitive and only allow charging at 0.5A would probably be a good idea.

The charger is a very good LiIon charger and a acceptable NiMH charger.



Notes

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