Contents:

Creatic 18650 Power Bank teardown and analysis

Teardown

Analysis

Test results

Measured values

Pros

Cons

Creatic 18650 Power Bank teardown and analysis

Teardown

teardownThis power bank is one of the cheapest (batery-less) you can ever buy. I gor my one from Ebay: USB Cellphone Backup Power Bank 18650 Battery Charger DIY Box/Case (No Battery).

It is so cheap that I was interested about its quality. It is easy to open: Just pulling with your finger is enough. The PCB can be pulled out by tweezers.

PCB top view PCB top lower view PCB top up view with flash PCB top down view with flash
PCB bottom view PCB bottom view with flash PCB bottom side view

Analysis

As you can see, the device is equipped by two ICs, both from Chinese company Creatic:

It does mean, that this power bank is a fully featured protected power bank plus a fully featured intelligent 18650 charger!

Adjusted overlay image of the board for The GIMP:

overlay image

Test results

Measured values

Power bank output voltage with no load: 5.1250V ±0.0003V

Switching power supply turns off at: 2.96V (But it does not turn output off!)

Switching power returns back at: 3.07V

Quiescent battery drain: 0.158mA at 3.7V

CC/CV switch while charging: about 4.17V

Pros

Cons