TENOZEK Dual USB Power Bank 13000mAh
![DSC_9500](https://lygte-info.dk/pic/USB%20Box/37%20TENOZEK%20Dual%20USB%20Power%20Bank%2013000mAh/DSC_9500.jpg)
Official specifications:
- Material: PC & ABS
- Color: White
- Output Interface: Dual USB
- Output: 1:5V 1A, 2:5V 2A
- Battery Type: Lithium Battery
- Dimensions: (5.51 x 2.56 x 0.98)" / (14 x 6.5 x 2.5)cm (L x W x H)
- Weight: 9.88oz / 280g
- Input: DC 5V 1A/2A
- Type: Emergency/Portable
- Battery Capacity(mAh): 13000
I got it from tmart.com
How does it look
![DSC_9489](https://lygte-info.dk/pic/USB%20Box/37%20TENOZEK%20Dual%20USB%20Power%20Bank%2013000mAh/DSC_9489.jpg)
The power bank is delivered in a clam shell, this looks to be a fairly universal box, that is used for multiple models.
![DSC_9499](https://lygte-info.dk/pic/USB%20Box/37%20TENOZEK%20Dual%20USB%20Power%20Bank%2013000mAh/DSC_9499.jpg)
Contents was the charger and a usb cable, no instruction sheet.
![DSC_9501](https://lygte-info.dk/pic/USB%20Box/37%20TENOZEK%20Dual%20USB%20Power%20Bank%2013000mAh/DSC_9501.jpg)
![DSC_9507](https://lygte-info.dk/pic/USB%20Box/37%20TENOZEK%20Dual%20USB%20Power%20Bank%2013000mAh/DSC_9507.jpg)
On this end is the two usb output connectors, they are marked A and B
![DSC_9508](https://lygte-info.dk/pic/USB%20Box/37%20TENOZEK%20Dual%20USB%20Power%20Bank%2013000mAh/DSC_9508.jpg)
On top of the power bank is the fuel gauge, it is 4 blue leds.
![DSC_9506](https://lygte-info.dk/pic/USB%20Box/37%20TENOZEK%20Dual%20USB%20Power%20Bank%2013000mAh/DSC_9506.jpg)
The micro usb charging input and the fuel gauge on button is placed on the side.
![DSC_9505](https://lygte-info.dk/pic/USB%20Box/37%20TENOZEK%20Dual%20USB%20Power%20Bank%2013000mAh/DSC_9505.jpg)
Measurements
- Both Usb output is coded as usb charger (DCP)
- Both outputs are in parallel.
- Output is always on, except when charging.
- The gauge turns on when output is loaded.
- Size: 140 x 63.6 x 22.5mm
- Weight: 280g (Accessories not included)
![TENOZEK%2013000mAh%20A%20load%20sweep](https://lygte-info.dk/pic/USB%20Box/37%20TENOZEK%20Dual%20USB%20Power%20Bank%2013000mAh/TENOZEK%2013000mAh%20A%20load%20sweep.png)
![TENOZEK%2013000mAh%20B%20load%20sweep](https://lygte-info.dk/pic/USB%20Box/37%20TENOZEK%20Dual%20USB%20Power%20Bank%2013000mAh/TENOZEK%2013000mAh%20B%20load%20sweep.png)
Both outputs can deliver about 1.4A, not 1A and 2A as the specifications on the bottom says.
![TENOZEK%2013000mAh%20load%20sweep](https://lygte-info.dk/pic/USB%20Box/37%20TENOZEK%20Dual%20USB%20Power%20Bank%2013000mAh/TENOZEK%2013000mAh%20load%20sweep.png)
Running the two output in paralle do not show more power.
![TENOZEK%2013000mAh%20usb%20out%2010ohm](https://lygte-info.dk/pic/USB%20Box/37%20TENOZEK%20Dual%20USB%20Power%20Bank%2013000mAh/TENOZEK%2013000mAh%20usb%20out%2010ohm.png)
Nice stable voltage when running at low load.
![TENOZEK%2013000mAh%20usb%20out%205ohm](https://lygte-info.dk/pic/USB%20Box/37%20TENOZEK%20Dual%20USB%20Power%20Bank%2013000mAh/TENOZEK%2013000mAh%20usb%20out%205ohm.png)
At 1A the voltage starts to drop the last few minutes, this means the power bank will not be able to provide much more power.
![10ohm](https://lygte-info.dk/pic/USB%20Box/37%20TENOZEK%20Dual%20USB%20Power%20Bank%2013000mAh/10ohm.png)
Noise is 13mV rms and 106mVpp
![5ohm](https://lygte-info.dk/pic/USB%20Box/37%20TENOZEK%20Dual%20USB%20Power%20Bank%2013000mAh/5ohm.png)
Noise is 20mV rms and 246mVpp, this is low values.
![TENOZEK%2013000mAh%20charge](https://lygte-info.dk/pic/USB%20Box/37%20TENOZEK%20Dual%20USB%20Power%20Bank%2013000mAh/TENOZEK%2013000mAh%20charge.png)
Charging requires a lot of patience, it takes about 18 hours! The good thing is that it will work with a fairly weak (1A) usb power supply.
![TENOZEK%2013000mAh%20charge%200.5ohm](https://lygte-info.dk/pic/USB%20Box/37%20TENOZEK%20Dual%20USB%20Power%20Bank%2013000mAh/TENOZEK%2013000mAh%20charge%200.5ohm.png)
A 0.5ohm resistor in series with the usb supply to simulate a weak power supply or long cable do not prevent the box from charging. It even chargers a bit faster.
Tear down
This power bank stopped working exactly when I was finished with testing, the reason is probably a faulty chip and not something with the power bank.
![Temp4210](https://lygte-info.dk/pic/USB%20Box/37%20TENOZEK%20Dual%20USB%20Power%20Bank%2013000mAh/Temp4210.png)
HS1: 62,8
The first I noticed was that I could not turn the power bank on, but when I touched it there was some heat. I opened it and as can be seen the chip is generating heat, and the power bank is not connected to anything. A clamp meter showed about 100mA was used from the batteries.
![DSC_9717](https://lygte-info.dk/pic/USB%20Box/37%20TENOZEK%20Dual%20USB%20Power%20Bank%2013000mAh/DSC_9717.jpg)
The batteries are 2600mAh, but do not have any brand names on them.
![DSC_9718](https://lygte-info.dk/pic/USB%20Box/37%20TENOZEK%20Dual%20USB%20Power%20Bank%2013000mAh/DSC_9718.jpg)
The circuit uses a single chip designed for power bank usage, it can either charger or discharge the batteries
![DSC_9719](https://lygte-info.dk/pic/USB%20Box/37%20TENOZEK%20Dual%20USB%20Power%20Bank%2013000mAh/DSC_9719.jpg)
![DSC_9720](https://lygte-info.dk/pic/USB%20Box/37%20TENOZEK%20Dual%20USB%20Power%20Bank%2013000mAh/DSC_9720.jpg)
![DSC_9723](https://lygte-info.dk/pic/USB%20Box/37%20TENOZEK%20Dual%20USB%20Power%20Bank%2013000mAh/DSC_9723.jpg)
![DSC_9722](https://lygte-info.dk/pic/USB%20Box/37%20TENOZEK%20Dual%20USB%20Power%20Bank%2013000mAh/DSC_9722.jpg)
![DSC_9724](https://lygte-info.dk/pic/USB%20Box/37%20TENOZEK%20Dual%20USB%20Power%20Bank%2013000mAh/DSC_9724.jpg)
Conclusion
The power bank has lots of capacity, low noise and can deliver about 1A. With this large power bank I would have liked the rated 2A or even 2.5A.
Due to the lower capacity batteries used, the power bank is a bit on the heavy side compared to capacity.
Assuming the break down was a freak accident, I will rate it as fairly good.
Notes
The power bank was supplied by tmart for a review.
Read more about how I test USB power supplies and chargers