I bought this EC Technology 5200mAh power bank from Amazon on a lightning deal for £7.64. It no longer seems to be available to buy so there’s no link to it. It is just about OK, but nothing special.
In the box
- Capacity: 5200 mAh / 19240 mWh
- Dimensions: 95 x 43 x 25 mm
- Weight: 124g
- Micro USB cable length: 50 cm
- Input: 1 micro-USB
- Output: 1 USB A - 5V up to 2.4A
Claims to deliver 2.4A, seems to suffer significant voltage drop above 2.5A. Perfectly fine.
The cable is around 50cm long. It has some strain relief but it’s not very flexible. At 2.1A it drops 0.25V, or 5%. At 2.4A it drops 0.3V or 6%. This is nothing special, but it’s adequate.
Delivered 2.4A consistently over 5V during the course of most of the test. It delivered 2992 mAh at 5 volts, or 15095 mWh, which is ~78.5% of the rated capacity which is lower than I’d hope, but it’s just about ok. It did generate a lot of heat - with the USB connector of the meter being almost too hot to touch.
It did cut the power off cleanly at the end, although the output voltage was wobbling between 4.5 and 5V for the last 3 minutes or so of the test.
The 4 blobs seem to approximately represent the 25%, 50%, 75% and 100% marks.
Standby Power Loss
Seems OK. I’m not sure how well charged it was when it arrived. It has been on my shelf for 8 weeks and was approximately half full when I opened it.