Test/review of Xtar PB2 Charger & power bank

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HKJ
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Test/review of Xtar PB2 Charger & power bank

Xtar PB2 Charger & power bank
DSC_9068
DSC_9069 DSC_9071
This is a 18650 charger and power bank from Xtar.
DSC_9062 DSC_9063 DSC_9064 DSC_9065
It arrived in a white cardboard box with a window in and some specification on it.
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The box contained the charger, a usb cable and a instruction sheet.
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The charger is usb powered with a micro usb input and a usb output for the power bank function.
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This button is used to turn the power bank on, this is only needed when checking the power level, it will automatic turn on when a load is connected.
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The display shows from 00 to 100, depending on how much capacity is in the power bank. While charging one of the digits will flash. When powered on or reset is will show a counting sequence: 00-11-22-33-44-55-66-77-88-99- for external usb power and 99-88-77-66-55-44-33-22-11- for internal battery power.
DSC_9070
The lid uses magnets, this makes it fairly easy to open when you stick you nail into a small slot. The magnets are strong enough that you can easily lift the box in the lid, when it is filled with batteries.
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supportedBatteryTypes
supportedBatterySizes
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This charger only supports unprotected 18650 batteries.
Measurements


  • Power consumption from usb when idle with no batteries is 9mA
  • Will charge one battery with 2A
  • Will charge two batteries with down to 1A on each (Lowest voltage will get more current)
  • Will discharge a full battery with about 0.5mA when powered.
  • Will discharge a full battery with about 0.1mA when not powered.
  • Below 0.5V the charger will report error
  • Between 0.5 and 3V the charger will charge with low current (200-300mA)
  • Above 3V the charger will use full current.
  • Will not restart charging if voltage drops.
  • Will restart charging if battery is inserted.

Xtar%20PB2%20%28SA18650-33%29%20%231
A nice CC/CV charge curve with termination around 100mA
Xtar%20PB2%20%28SA18650-33%29%20%232
Second slot looks similar.
Xtar%20PB2%20%28PA18650-31%29%20%231
Xtar%20PB2%20%28SA18650-26%29%20%231
These two other batteries is also charged nicely.
Xtar%20PB2%20%282xSA18650-33%29
With two batteries the charge current drops to 1A to keep the usb input current at 2A.
Xtar%20PB2%200.5ohm%20%282xSA18650-33%29
Adding 0.5ohm resistance in series with the power supply to simulate a long cable or weak supply shows that the charger will reduce usb and charge current, but the charging works fine.
Temp5434
M1: 34.6°C, M2: 43.9°C, HS1: 45.0°C
There is some electronic inside the charger that gets a bit warm, but the battery box do not look warm.
Temp5435
M1: 37.2°C, M2: 37.3°C, HS1: 46.5°C
Batteries are below 40°C while I am charging with lid on, this is fine.
Temp5436
M1: 40.7°C, HS1: 51.7°C
And the hottest part of the charger electronic do not look very hot.
Poweron
The charger is very fast to start, it only needs about 1 seconds.
Power bank

  • Will discharge a full battery with about 0.1mA when not powered.
  • Usb output turns off after 45 seconds with load below 290mA, with no load it turns off after 10 seconds.
  • Usb input and output is not directly connected, no output voltage leaks to the usb input.
  • Cannot be used as a UPS, output turns off when usb power is removed.
  • Usb output is coded with usb charger (DCP)

Xtar%20PB2%20%28SA18650-33%29%20%231%20load%20sweep
With one battery the charger is rated for 1A and overload trips at 1.3A, this looks fine.
All load sweeps make a measurement at 0 then jumps to a bit above 300mA to avoid auto turnoff.
Xtar%20PB2%20%282xSA18650-33%29%20load%20sweep
With two batteries the rating is 2A and it can deliver a bit above 2.4A.
Xtar%20PB2%20%28no%20batteries%29%20load%20sweep
With no batteries in the charger, but usb power connected it passes the power through, but there is some voltage drop.
Xtar%20PB2%20%28empty%20battery%29%20load%20sweep
With one empty battery the charger will charge the battery, but keep the usb power draw at 2A, this is the reason for the low efficiency at low current.
Below efficiency curve is only valid with one battery in the charger
Xtar%20PB2%20usb%20out%2010ohm%20%28SA18650-33%29%20%231
As a power bank it can easily deliver 0.5A until the battery is down to about 3.2V, where it turns off.
Xtar%20PB2%20usb%20out%2010ohm%20%28SA18650-33%29%20%232
Second channel looks the same.
Xtar%20PB2%20usb%20out%2010ohm%20%282xSA18650-33%29
With two batteries the time is slight more than double up.
Xtar%20PB2%20usb%20out%205ohm%20%28SA18650-33%29%20%231
One battery can also handle 1A load and the voltage stays stable (more or less) until the battery is empty.
There is no overload protection here, charger depends on overload protection in the usb charger used to power it.
Xtar%20PB2%20usb%20out%205ohm%20%282xSA18650-33%29
With two batteries the time is again more than double.
Xtar%20PB2%20usb%20out%202.5ohm%20%282xSA18650-33%29
For 2A output two batteries are required.
The output voltage jumps up and down on all the curves, but stays within the required usb range.
10ohm
There is 24mV rms noise and 287mVpp noise.
5ohm
There is 157mV rms noise and 405mVpp noise.
2.5ohm
There is 72mV rms noise and 869mVpp noise.
Conclusion
This charger and power bank has a good size for a two battery device and the magnetic lid is easy to open. The charging looks good, but batteries must be able to handle 2A charge current.
The power bank has enough power to maintain output voltage, until the batteries are empty, the coding is also fine, but I could have wished for lower noise on the output, this jumping up/down in voltage may force some devices to a lower charger current.
I will rate is as a fairly good power bank and charger.
Notes
The charger was supplied by XTAR for a review.
Here is an explanation on how I did the above charge curves: How do I test a charger

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

Edited by: HKJ on 06/01/2018 - 10:25
THE_dAY
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Thank you HKJ!
Do you find the texture of the hard matte finish to have a slippery feel?

HKJ
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THE_dAY wrote:
Do you find the texture of the hard matte finish to have a slippery feel?

It is smooth, but the fell is a bit like rubber (It is some sort of coating).

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

THE_dAY
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HKJ wrote:
THE_dAY wrote:
Do you find the texture of the hard matte finish to have a slippery feel?

It is smooth, but the fell is a bit like rubber (It is some sort of coating).


Thanks, that sounds good. Was hoping for a rubbery coating (better grip) for travel.
bmengineer
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Is the 0.1 mA and 0.5 mA discharge you listed the drain from the batteries when stored in the charger? i.e. if I throw this in a bag with cells in it for the weekend, it will slowly lower the charge at 0.1 mA?

Find all my reviews of flashlights and more gear at www.bmengineer.com

desmondkun
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Thanks for review.
It has output voltage problem, huh? I hope Xtar will fix it.

Take care of your flashlight and your flashlight will take care of you.

HKJ
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bmengineer wrote:
Is the 0.1 mA and 0.5 mA discharge you listed the drain from the batteries when stored in the charger? i.e. if I throw this in a bag with cells in it for the weekend, it will slowly lower the charge at 0.1 mA?

The 0.1mA means it will empty 2800mAh batteries in about 3 years. In praxis it will take longer than that, because the draw will be lower at lower voltage, this means you will get 1 year more before the batteries are completely discharged (Assuming no self-discharge in the batteries).

As you can see it takes a bit more than a weekend before it is significant.

desmondkun wrote:
It has output voltage problem, huh? I hope Xtar will fix it.

I will not directly call it a problem, but a more stable voltage is better.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

qandeel
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Thanks for the review HKJ. Entertaining and informative as usual. I’m waiting for 2 these babies.

 عُمَانْ

klrman
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Thanks for the nice review.  Mine should be arriving soon but I never knew it could not fit protected batteries, which all mine are!  

nquinn
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How dangerous/bad for electronics is 287mVpp and 405mVpp noise? This is nearly 4-5x the noise levels of the similar Tomo M2 18650 powerbank.

My typical use case will simply be charging my iPhone.

BlueSwordM
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Nothing dangerous really.

There will simply be a bit higher power loss going to the phone, making it charge slowler.

My very own high current Beryllium Copper springs Gen 3:
http://budgetlightforum.com/node/67401
Liitokala Aliexpress Stores Battery Fraud: http://budgetlightforum.com/node/60547

HKJ
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nquinn wrote:
How dangerous/bad for electronics is 287mVpp and 405mVpp noise?

It is not dangerous. Voltages above 5.25V may be dangerous, it depends on the phone (I would not expect any danger below 5.5V). High noise levels may interfere with the touch screen and with receiving, but it will depend on the frequency content and level of the noise and how sensitive the phone is for noise. It is not dangerous for the phone.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

ferongr
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This looks like an excellent charger/powerbank combination for travelling light. Thanks for the review.

jacc
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Hi HKJ

Any chance you will disassemble the powerbank to take a look at the internals? Anyone seen the PCB before? No idea why the PB is designed so large with so much space wastage on battery bays (the sides). It could be very much smaller.

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HKJ wrote:
Cannot be used as a UPS, output turns off when usb power is removed.

What does this mean?

The Cycle of Goodness: “No one prospers without rendering benefit to others”
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chinooker
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I would want it a bit longer in the bay to accommodate button top cells. And the worst flaw of all is its inability to charge low draw items, ie: Nitecore TIP/TINI/Tube, Sansa/Sony MP3 players, UltraTac K18 mini charger, MecArmy SGN5, and anything drawing less than 300mA.

Not handy at all on a long trip. Why did they limit it so?

HKJ
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DavidEF wrote:
HKJ wrote:
Cannot be used as a UPS, output turns off when usb power is removed.
What does this mean?

UPS is “uninterruptible power supply” and means the device will switch smoothly between input power and battery and back again to always supply output power.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

HKJ
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jacc wrote:
Hi HKJ

Any chance you will disassemble the powerbank to take a look at the internals? Anyone seen the PCB before? No idea why the PB is designed so large with so much space wastage on battery bays (the sides). It could be very much smaller.

No, I do not want to break it open. The width of the sides are probably to support the magnets.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

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HKJ wrote:
DavidEF wrote:
HKJ wrote:
Cannot be used as a UPS, output turns off when usb power is removed.
What does this mean?

UPS is “uninterruptible power supply” and means the device will switch smoothly between input power and battery and back again to always supply output power.


Okay, I understand what a UPS is. What I don’t understand is where you said it turns off when USB power is removed. Do you mean that it turns off briefly or turns off completely, and something has to be done to turn it back on?

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Quote:
Okay, I understand what a UPS is. What I don’t understand is where you said it turns off when USB power is removed. Do you mean that it turns offbriefly or turns off completely, and something has to be done to turn it back on?

If input to the Xtar drops, then recovers, the Xtar will carry on charging as before, but the output of the Xtar to a connected device will drop, and not resume until the Xtar button is pressed.

Beam me up!

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Okay, thanks for the explanation Zulumoose! It seems like a weird bug. I hope XTAR fixes it in the future.

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Quote:
This charger and power bank has a good size for a two battery device and the magnetic lid is easy to open. The charging looks good, but batteries must be able to handle 2A charge current. The power bank has enough power to maintain output voltage, until the batteries are empty, the coding is also fine, but I could have wished for lower noise on the output, this jumping up/down in voltage may force some devices to a lower charger current.

2A output is important for me. Can you recommend a similar power bank that has lower noise.
Doesn’t have to be 2 cells. 3, 4 or more cells would be even more great Smile

Chargers: 1xBasen BD01 5/5, 1x Gyrfalcon All-88, LiitoKala: 3x100 4/5, 2x202 5/5, 1x402 3/5., MiBoxer C4-12 3/5.
Flashlights: BLF Q8 4/5, DQG Tiny III 26650 5/5, FiTorch MR35 3/5, Haikelite SC26 HD 3/5, Lumintop Tool AA/AAA 4/5, Nitecore LA10, Sofirn C01 BLF 3200k/5600k, Zebralight H600Fc 3/5.
Powerbanks: EasyAcc 26800 mAh 3/5, Xtar PB2 4/5.
Waiting for: (DQG Tiny) 21700 EDCs. Xtar powerbank that (also) takes 20700, 21700, 26650

ActiveAl
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The diagram and comments below are an excerpt from the HKJ report above.

Can one infer from this diagram that the efficiency for the PB2 with one cell averages about 88%? Can one also assume that the efficiency will be about the same with two cells?

BTW, the advertised efficiency from the XTAR Official Store on AliExpress is "up to 92%." Thanks.

<START EXCERPT>


 

Below efficiency curve is only valid with one battery in the charger.

As a power bank it can easily deliver 0.5A until the battery is down to about 3.2V, where it turns off


<END EXCERPT>

Why are there no USB out efficiency measurements available with two cells in the PB2? HKJ, thanks for what you do!

HKJ
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Efficiency will be best with highest input voltage and fairly low current drain (How low depends on the consumption of the circuit itself), I would not expect much if any difference between one and two cells.

The problem measuring efficiency is that I need to measure the battery current, this requires I put something between the battery and the boost converter in the box. I have only made one sensor for this, if I wanted to do it for two batteries I would need two sensors and four voltmeters on the battery side (Or open the box and mount a resistor between batteries and boost converter).

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

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HKJ wrote:
Efficiency will be best with highest input voltage and fairly low current drain (How low depends on the consumption of the circuit itself), I would not expect much if any difference between one and two cells. The problem measuring efficiency is that I need to measure the battery current, this requires I put something between the battery and the boost converter in the box. I have only made one sensor for this, if I wanted to do it for two batteries I would need two sensors and four voltmeters on the battery side (Or open the box and mount a resistor between batteries and boost converter).

 

HKJ, thank you for the quick reply - and your good, hard work. Could you make a qualitative assessment of the PB2 power bank USB out efficiency in comparison to others that you have tested? Would you say it Is above average, for example? What do you think of the manufacturer's claim of up to 92% efficiency? Thanks.

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ActiveAl wrote:

 


HKJ, thank you for the quick reply – and your good, hard work. Could you make a qualitative assessment of the PB2 power bank USB out efficiency in comparison to others that you have tested? Would you say it Is above average, for example? What do you think of the manufacturer’s claim of up to 92% efficiency? Thanks.

The 92% sounds about right, the numbers in my logfile says 91.5% at the start. There is some tolerance on my measurement, the usb cable and connections will add resistance and my 10ohm load resistor is 0.3% too high.

I cannot remember the efficiency of the different power banks I test, you will have to find them and compare the efficiency curve, but it is better than Soshine E4S.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

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HKJ,

Is it possible that in future tests, you also give a few efficiency percentages at different loads if you happen to know them as ‘byproduct’ of your tests?

Chargers: 1xBasen BD01 5/5, 1x Gyrfalcon All-88, LiitoKala: 3x100 4/5, 2x202 5/5, 1x402 3/5., MiBoxer C4-12 3/5.
Flashlights: BLF Q8 4/5, DQG Tiny III 26650 5/5, FiTorch MR35 3/5, Haikelite SC26 HD 3/5, Lumintop Tool AA/AAA 4/5, Nitecore LA10, Sofirn C01 BLF 3200k/5600k, Zebralight H600Fc 3/5.
Powerbanks: EasyAcc 26800 mAh 3/5, Xtar PB2 4/5.
Waiting for: (DQG Tiny) 21700 EDCs. Xtar powerbank that (also) takes 20700, 21700, 26650

HKJ
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ZoomieFan wrote:
HKJ,

Is it possible that in future tests, you also give a few efficiency percentages at different loads if you happen to know them as ‘byproduct’ of your tests?

You already get efficiency at 3 different currents: 0.5A, 1A and 2A
I do not measure them when doing load sweep, because I do not have sense electronic on the batteries while doing that test.

My problem is that the sense electronic will degrade the performance of the power bank slightly. I do that when running discharge test, but avoid it on the load sweep.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

ZoomieFan
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I guess I need a crash course reading your tests Smile
Anyway I checked the graphs again, and see an efficiency line in some graphs.
But I don’t in others.
Xta PB2 usb out 5ohm (2xSA18650-33)
Xta PB2 usb out 2.5ohm (2xSA18650-33)
I see no black efficiency line in those graphs.
Well, I do all the way at the end.
Does that mean the efficiency line is hidden under the USB voltage* line?

*= I think that’s USB voltage instead of (battery) voltage. My ageing eyes have some trouble keeping the reds apart.
If not too much trouble, can you consider more contrasting colors in future tests?

If the efficiencies are what I think the are, the Xtar is very good. Always well above 85%. That’s (almost) on par with Anker stuff.
http://budgetlightforum.com/node/49178

But that comparison possibly isn’t fair. My reasoning is this, and please correct me if I’m wrong: The Anker likely has 8 cells, 4x more than the Xtar; so at a 2A draw the Anker cells have to deliver 4x less per cell, and that increases efficiency.

HKJ please don’t see the above as talking negative about your work. A little secret… when I’m looking for something the very first thing I do is scroll down to the conclusion of your tests. If it doesn’t get your thumbs up, I don’t even bother reading the rest.
Keep up teh good work buddy!

Chargers: 1xBasen BD01 5/5, 1x Gyrfalcon All-88, LiitoKala: 3x100 4/5, 2x202 5/5, 1x402 3/5., MiBoxer C4-12 3/5.
Flashlights: BLF Q8 4/5, DQG Tiny III 26650 5/5, FiTorch MR35 3/5, Haikelite SC26 HD 3/5, Lumintop Tool AA/AAA 4/5, Nitecore LA10, Sofirn C01 BLF 3200k/5600k, Zebralight H600Fc 3/5.
Powerbanks: EasyAcc 26800 mAh 3/5, Xtar PB2 4/5.
Waiting for: (DQG Tiny) 21700 EDCs. Xtar powerbank that (also) takes 20700, 21700, 26650

HKJ
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Efficiency will only be valid with one cell, one the 2xSA18650-33 charts it will be way to high, because I only measure current for one cell.

Number of cells do not really affect efficiency, but each cell may deliver slightly more energy due to less voltage sag.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

ZoomieFan
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HKJ wrote:
Efficiency will only be valid with one cell, one the 2xSA18650-33 charts it will be way to high, because I only measure current for one cell.

Number of cells do not really affect efficiency, but each cell may deliver slightly more energy due to less voltage sag.

For me that’s the main measurement of efficiency.
The percentage of energy in the cell(s) that becomes available at the USB port of the power bank.

Chargers: 1xBasen BD01 5/5, 1x Gyrfalcon All-88, LiitoKala: 3x100 4/5, 2x202 5/5, 1x402 3/5., MiBoxer C4-12 3/5.
Flashlights: BLF Q8 4/5, DQG Tiny III 26650 5/5, FiTorch MR35 3/5, Haikelite SC26 HD 3/5, Lumintop Tool AA/AAA 4/5, Nitecore LA10, Sofirn C01 BLF 3200k/5600k, Zebralight H600Fc 3/5.
Powerbanks: EasyAcc 26800 mAh 3/5, Xtar PB2 4/5.
Waiting for: (DQG Tiny) 21700 EDCs. Xtar powerbank that (also) takes 20700, 21700, 26650

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