Power bank Tech Armor ActivePower 3000



This is the smallest power bank from Tech Armor.
Official specifications:

• Battery type: Li-ion
• Capacity: 3000mAh/77Wh Wh specification is not correct
• Input: Micro-USB 5V/500mA
• Output: USB 5V/1.0A
• Dimension: 55mm x 9mm x 8mm These dimensions are from the manual, but are not correct
• Weight: 65.2g + 10g

How does it look



The power bank is delivered in a cardboard box with a list of all models on the backside.



It contains the power bank, a usb cable and a "instruction sheet".



All connectors and one indicator is placed at one end

• Micro usb: Charge input.
• 1A usb output.
• Small hole for led: Red:charge, Blue:full (The led can also been see in the usb output).

Measurements

• Device can work as ups.
• Input current is not directly affected by output current.
• Red light while charging
• Blue light when full.
• USB output is coded as usb charger (DCP).
• Size: length: 90mm diameter: 27mm
• Weight: 70g (Accessories not included)

Output starts to drop at 1.2A and is turned off at 1.7A.



Doing the same sweep with charge current connected, this time it could keep the output stable up to 1.4A and it did not turn off even at 2A load.
The charge input current was not directly affected by the load current, but it would ramp up to full charge current. It looks like the circuit is missing an overload protection, but when run on battery alone it will turn off due to voltage drop on the battery.



The power bank can supply nearly 2000mAh at 5 volt, this is a very good value for a 3000mAh power bank (mAh rating is based on battery, see capacity table).



Increasing the load will reduce the available mAh a bit. The boost converter cannot keep the voltage up during the full discharge, but stays within acceptable tolerances until the power bank is just about empty.



The noise is fairly low with 0.5A load at 24mV rms and 190mVpp.



But increases a bit at 1A load: 50mV rms and 320mVpp.



The charge starts slowly and increase to 1A current nearly immediately. I had to charge 3000mAh, i.e. the cell inside is about 3000mAh.



Adding a series resistor to the 5 volt charge supply will reduce the current, this makes it slower to charge, but it is charged just as fine as above.



Conclusion

I like the rounded triangular shape of the power bank and it works well.

I will call it a good power bank.



Notes

The power bank was supplied by Tech Armor for a review.

Read more about how I test USB power supplies and chargers