YZXStudio 8 Power Bank Review (4x18650)

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angerdan
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I don’t know BuyInCoins, so can’t say if anything is normal.
Why not just buy from taobao?

BlueSwordM
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Because for some reason, my credit card company blocks Taobao transaction every time, and the hassle of having to go and physically approve the transaction is too much in my opinion.

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

The_Driver
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I have some questions regarding this very interesting power bank (thanks for the nice intro & review!):

  1. Is version 8 still the newest variant? The review is from 2016
  2. If not, what are the differences btween it and the newer verison(s)?
  3. What is the standby current when the display is turned off and the device is lying around unplugged?
  4. If I reduce the charge voltage of the batteries and increase the minimum voltage to prolong their lifespan (for example min = 3.5V, max = 3.9V), does the percentage display react accordingly?
  5. What happens to the percentage display of the remaining capacity when a fast-charging device is plugged in and the voltage of the batteries drops?

To me the most interesting details about this power bank are that one can set the min & max battery voltages to increase the lifespan and that high-drain batteries can be used. They work much better in cold temperatures wallowing the power bank to truly be always ready. 

angerdan
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The_Driver wrote:

  1. Is version 8 still the newest variant? The review is from 2016
  2. What is the standby current when the display is turned off and the device is lying around unplugged?
  3. If I reduce the charge voltage of the batteries and increase the minimum voltage to prolong their lifespan (for example min = 3.5V, max = 3.9V), does the percentage display react accordingly?
  4. What happens to the percentage display of the remaining capacity when a fast-charging device is plugged in and the voltage of the batteries drops?

To me the most interesting details about this power bank are that one can set the min & max battery voltages to increase the lifespan and that high-drain batteries can be used. They work much better in cold temperatures wallowing the power bank to truly be always ready. 


  1. Yes, it is still the latest variant from YZXStudio.
  2. Standby current should be lower than in generation 7, because the springs have been replaced with soldered cells.
  3. I would expect the powerbank internal BMS to react accordingly.
  4. I like to try this when my copy has been married to some cells. Currently i have to find an service provider who offers point laser welding on batteries.

.
.
I have some questions for this forum too:
.
Which cell is best suited to use in the YZXStudio Powerbank?

And does the powerbank use a sensor to control the temperature of the cells?

The_Driver
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Thanks for your answer!
It doesn’t matter which of those cells you use. I would buy the cheapest of those three. They are very similar.

The_Driver
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angerdan wrote:
The_Driver wrote:

  1. Is version 8 still the newest variant? The review is from 2016
  2. What is the standby current when the display is turned off and the device is lying around unplugged?
  3. If I reduce the charge voltage of the batteries and increase the minimum voltage to prolong their lifespan (for example min = 3.5V, max = 3.9V), does the percentage display react accordingly?
  4. What happens to the percentage display of the remaining capacity when a fast-charging device is plugged in and the voltage of the batteries drops?

To me the most interesting details about this power bank are that one can set the min & max battery voltages to increase the lifespan and that high-drain batteries can be used. They work much better in cold temperatures wallowing the power bank to truly be always ready. 


  1. Yes, it is still the latest variant from YZXStudio.

There seems to be a 9th generation:
https://item.taobao.com/item.htm?spm=2013.1.20141003.9.639f5802VLcdYI&sc...

angerdan
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You’re right, great!
https://item.taobao.com/item.htm?spm=2013.1.20141003.9.639f5802VLcdYI&sc...
110€ without cells and 160€ with 3× 3450mAh 18650 cells.

But the 8th generation has 4× 18650 capability and there’s an version with even 8× 18650.

The_Driver
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But does it still have the display with the U.I. etc.? That’s one of the main features for me. It’s also extremely expensive!

angerdan
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It’s ~75% more expensive than the 8th generation.
And you could be right, i don’t see any display on the 9th generation.

Here are some pictures of the 8×18650 8th generation:
https://item.taobao.com/item.htm?spm=2013.1.20141002.11.495271aaOKJCyJ&s...

ScottJD
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The difference with the 9th version is I’d had USB C-PD changing, and you can charge it with USB C-PD also.
So if I read it correctly it can charge at 60 Watts, and charge other things like the iPad Pro and iPhone X at 29 Watts and maybe faster?

I forgot I bought the 8th version until recently, I’m lacking to move and ran across it.
I build it tonight, but noticed it has firmware 2.03 (still English).
Does anyone have firmware 3.0 or higher for the version 8 (4 cell) or and manual of calibrating it for the cell I installed?

I’m moving soon, and I bought one of those thermal electric portable refrigerators. The problem is running it fromthe car power or pulls 33 Watts and gets way to cold for my insulin and the 10 hour drive ahead of me. It also runs off USB and is the perfect temperature to not free thousands of $$$ of insulin.

I want to get the new firmware so I can have better control. I can have the battery charge a little while still powering this portable fridge. Then the battery should have enough kf a charge when I stop for breaks or food to keep the fridge running since the car power outlet turns off when the car shuts off.
Once I get back to the car in an hour or so and start it, the battery can keep rinnkng the fridge while also topping off the charge for the next stop.
But to have this control I need the firmware 3.?

My other option was to program and Arduino micro and control the current n/off and temperature regulate the fridge. But I don’t have the time, I packed the Arduino stuff already. But when I went to pack the battery bench I found the gen 8 again and still didn’t pack the spot welder. So I put it together tonight with 4 new Sanyo 18650GA 3500mA cells.
Seems to work good, default setting are 13,600 and tat acceptable for these cells. Once calibrated I should get s little more from them.

Once firmware is updated I will also have more control over the charge cutoff and other features. Despite missing USB C-PD I would like it to last and set the max voltage charger to 4.10 volts per cell. Besides, I already have a car power adapter to USB C-PD that does 29 Watts for other devices.

If you can post the firmware I would appreciate it. I have the programmer already and know I firmware 2.p3 doesn’t update over the micro USB port, but I know how to program it, and understand I might need to change the language back to English.
I think version 3.0 has English built in, I just need to navigate the menu to select it.

Thanks,
Scott
Gamdget Review Videos

d_t_a
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The YZXStudio official firmwares page is here (mostly in Chinese, but filenames are in English):

https://pan.baidu.com/s/1c4ahNg#list/path=%2F%E5%8D%87%E7%BA%A7%E6%96%87...

There is a Terminator 8 dated 2018 (the only file dated 2018). I presume it means v2.12.

angerdan
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Got my Powerbank soldered this friday (powerbank has been waiting for that since 15.11.2017…).
The diameter of the Keepower Cells has been to large, so Sanyo NCR18650GA hat been put in.
https://www.akkuteile.de/lithium-ionen-akkus/18650/keeppower/keeppower-i...
https://www.akkuteile.de/lithium-ionen-akkus/18650/samsung/sanyo-ncr1865...
https://lygte-info.dk/review/batteries2012/Sanyo%20NCR18650GA%203500mAh%20(Red)%20UK.html

Firmware version: 2.11-0526

Firmware Menu:

00: Out VOlt
01: Max Curr
02: Off Volt
03: AOff Curr
04: AOff Time
05: ChrgVolt
06: ChrgCurr
07: FullCurr
08: VoltDrop
09: In Curr
10: ShowTime
11: Bright
12: QNH
13: Wire Res
14: Batt Res
15: Protocoll
16: Ref Set
\/ \/ \/ \/ \/ \/
17: Capacity
18: Volt Ref
19: Curr Ref
20: 2.0A Ref
21: FullVolt
22: VullCurr
23: EmptVolt
24: EmptCurr
25: En-#-#
26: Default
.
.
Now i have several questions:

  • What charge/discharge options are recommended for considerate use of the NCR18650GA cells?
  • What other options are recommended to change (like USB output Voltage from 5.1xV to 5.0 Volt)?
  • What’s the latest english firmware version for the 8th gen 4cell powerbank?
  • Where can i download the latest english firmware version?
  • How to calibrate the cells?

angerdan
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angerdan wrote:
several questions:
1. What charge/discharge options are recommended for considerate use of the NCR18650GA cells?
2. What other options are recommended to change (like USB output Voltage from 5.1xV to 5.0 Volt)?
3. What’s the latest english firmware version for the 8th gen 4cell powerbank?
4. Where can i download the latest english firmware version?
5. How to calibrate the cells?

Any ideas here?
Currently my Firmware configuration looks like this:
02: Off Volt: 2,95V
05: ChrgVolt: 4,208V
06: ChrgCurr: 2A
07: FullCurr: 2,0A
23: EmptVolt: 3,00V
\/ \/ \/ \/ \/ \/
17 Capacity: 6.800Ah
18: Volt Ref: 1880
19: Current Ref: 1054
20: 2.0A Ref: 26779
21: FullVolt: 4,177V
22: FullCurr 2,20A
23: EmptVolt: 2,967V
24: EmptCurr: 0,80A

Here’s the HKJ Test of the Sanyo NCR18650GA 3500mAh:
https://lygte-info.dk/review/batteries2012/Sanyo%20NCR18650GA%203500mAh%20(Red)%20UK.html
http://budgetlightforum.com/node/45975

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