Xiaomi Nextool XHP50.2 short review

3 posts / 0 new
Last post
WestBam
WestBam's picture
Offline
Last seen: 2 weeks 1 day ago
Joined: 02/23/2016 - 17:04
Posts: 340
Location: Hungary
Xiaomi Nextool XHP50.2 short review

Dear All,

You can find a full, more detailed review on my flashlight blog. Use google translate. Original language: Hungarian.
In this short article I will show you the Xiaomi Nextool XHP50.2 flashlight.

Brand: Nextool (Xiaomi Youpin)
Model: XHP50.2
Emitter: Cree XHP50.2
Luminous Flux: 2000 LM
Max Beam Intensity: 40600 cd (my measurement)
Switch: electronic
Battery: 26650 (included)
Modes: 5 (turbo, high, medium, low, SOS)
Lens: Plastic
Waterproof: IPX7

The box is made of good quality, thick cardboard with Chinese writing. It already has a cheaper plastic profile that holds the flashlight and its accessories. A 26650 battery, wrist strap and a short charging cable are in the box. The operating instructions are in Chinese.

The manufacturer glued the lamp together, I couldn’t disassemble it. Only the tailcap can be removed.

The head and body form a unit due to gluing. The head has a large OP reflector with a Cree XHP50.2 LED at the bottom. The switch is on the head side of the body. The switch is interesting because it’s like a forward clicky switch, but it certainly isn’t. I think it’s electronically controlled. The head can be unscrewed slightly, here is the USB type C charging connector. The body has a tiny square texture, good grip.

Taicap has only a conductive role, a simple structure. Nextool XHP50.2 can be safely mounted on it as a candle.

A flashlight of quite a large size, compared to a couple of my other flashlights, is shown below. First in line is the 26650 battery, followed by the Astrolux S1 flashlight, Convoy C8 + flashlight, Olight Warrior X flashlight, and the Nextool XHP50-2 flashlight at the end of the line.

Easy to use. Pressing the button halfway turns on the lamp light in turbo mode. Unfortunately, the lamp always starts in turbo mode. Press the button until it clicks, the Nextool flashliht is on. After switching on, press the button halfway and then release it to switch to high, medium and low modes. To activate the SOS morse flash, press the button halfway for 3 seconds and then release it.

I also tried the built-in charging. Unfortunately, the charging current was only 1.2A, the Nextool XHP50.2 flashlight did not draw more current. The 4 LEDs next to the switch indicate the charge level. When charging is complete, all 4 blue LEDs are lit. At the end of the charge I measured 4.29V in the battery, which is a very high value, it overcharges the battery !!!

The battery 26650 is manufactured by Dalian CBAK Power Battery Co., Ltd. I measured 5463 mAh capacity, the internal resistance of the battery is 12 mΩ. It looks like a very good quality product!

Measurement started in turbo mode goes on at a fairly low luminous flux after stepping down. Because of this, it does not have significant warming. The horizontal axis indicates time, the vertical axis the temperature in ° C. Convert to Fahrenheit formula is: ° F = ° C · 1.8 + 32.

The runtime graph is more interesting. I tried it first, there is no thermal protection, there is a timed step back in the program. As the battery sinks, the luminous flux of the turbo mode decreases pretty slowly. In turbo mode, it returns to 32% after 1.5 minutes, which is roughly 640 lumens. Its light is not stabilized, it fades over time. After 200 minutes, it returns to moonlight mode.

A distance of 100 meters is not a problem, it easily illuminates the target. On the right, the tree is 100 meters away.

A larger test is a distance of 200 meters. The cave is 200 meters away from the place of photography. You can see my favorite, the Olight Warrior X, which is a much brighter lamp with the same luminous flux.

Conclusion: I was basically surprised that the manufacturer did not lie, the value of the luminous flux on the box is real. Its light is specifically usable and in the right amount, even after stepping back. Unfortunately, it overcharges the battery, which is dangerous, so I do not recommend using the built-in charger.
You can buy:
Nextool XHP50.2 – GearBest
Nextool XHP50.2 – BangGood

Edited by: WestBam on 05/20/2020 - 07:30
d_t_a
Offline
Last seen: 4 hours 29 min ago
Joined: 08/04/2017 - 23:58
Posts: 1837
Location: Manila, Philippines

Good comprehensive review.

Some points:

1) charged voltage: I’ve also tested charging a battery inside the Nextool XHP50.2 flashlight, and noted it charged to around 4.28-4.30v, which is overcharging the battery. Hadn’t read other reports of it, but your test confirms that the overcharging likely occurs for most Nextool XHP50.2 flashlights (unless they change it, if people will report/complain more about this issue)

2) timed stepdown
I haven’t done it runtime test for this flashlight yet (I have downloaded the zak.wilson’s ceilingbounce app but don’t have a ‘lumens tube’ and can only do some not-so-controlled ceiling bounce measurement). In your runtime graph, it appears there is a timed stepdown of 7-8 minutes, which I’ve also read from another review. Do you think this is timer based and not combined with temperature sensing?

3) battery
- you mentioned it uses BAK 26650 batteries. How do you identify a BAK 26650 battery?

I’ve noted that the Nextool XHP50.2 flashlight comes with at least 2 different types of 26650 batteries:

(measurements taken with YR1030 battery resistance tester, measures AC IR)

the left side Nextool 26650 tested 13mOhms at 3.62v (from shipped)
the right side Nextool 26650 tested 17mOhms at 3.88v (from shipped)


Which one is BAK? Any idea what the other battery is?

(I notice that Sofirn’s 26650 also uses similar to these 2 types for their 26650, but Sofirn also has a 3rd type of 26650)

WestBam
WestBam's picture
Offline
Last seen: 2 weeks 1 day ago
Joined: 02/23/2016 - 17:04
Posts: 340
Location: Hungary

d_t_a wrote:

1) charged voltage: I’ve also tested charging a battery inside the Nextool XHP50.2 flashlight, and noted it charged to around 4.28-4.30v, which is overcharging the battery. Hadn’t read other reports of it, but your test confirms that the overcharging likely occurs for most Nextool XHP50.2 flashlights (unless they change it, if people will report/complain more about this issue)

Your measurement also confirms that the built-in charger is faulty.

d_t_a wrote:

2) timed stepdown
I haven’t done it runtime test for this flashlight yet (I have downloaded the zak.wilson’s ceilingbounce app but don’t have a ‘lumens tube’ and can only do some not-so-controlled ceiling bounce measurement). In your runtime graph, it appears there is a timed stepdown of 7-8 minutes, which I’ve also read from another review. Do you think this is timer based and not combined with temperature sensing?

There is no thermal protection in it, only the driver has a timed step down. I heated up mine (see in stress-test picture in runtime gif picture), it was hot on my hands (~60°C), but there was still no power drop.

d_t_a wrote:

3) battery
- you mentioned it uses BAK 26650 batteries. How do you identify a BAK 26650 battery?

I’ve noted that the Nextool XHP50.2 flashlight comes with at least 2 different types of 26650 batteries:

(measurements taken with YR1030 battery resistance tester, measures AC IR)

the left side Nextool 26650 tested 13mOhms at 3.62v (from shipped)
the right side Nextool 26650 tested 17mOhms at 3.88v (from shipped)


Which one is BAK? Any idea what the other battery is?


The battery on the left is the same as my battery. It didn’t read the CBAK mark directly on it, but google helped me find the battery manufacturer. Take a photo (it all round) of the other battery and upload it here. I’ll see if there is any reference to the manufacturer.