Uploaded March 2026 | Updated September 2026, 2 weeks ago

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Compact 18650 power bank case review and output test. In this video we test a budget DIY 18650 power bank battery case, analyze the SM5401S charging controller, check the 5V USB output stability and evaluate the overall build quality.

If you are looking for a mini power bank kit for emergency power or camping, this practical test shows how the case performs with a real 18650 battery.

⏱ Chapter breakdown
00:00 Mini power bank DIY kit overview
00:09 PCB and controller analysis
00:32 Installing the 18650 battery
00:50 Output voltage stability test
01:24 Emergency light test with USB lamp
01:38 Wall charging test
02:00 Voltage and current measurements
02:50 Device dimensions

🔧 Full spec sheet and guide
lifekaki.com

🛒 18650 Power Bank Case
https://s.click.aliexpress.com/e/_c3DH9sMT

🔋 Rechargeable Battery (LiitoKala 18650 3500mAh)
https://s.click.aliexpress.com/e/_c4t2ejw7

Purchased with my own money. No sponsors.
If you plan to buy this mini power bank case later — save the video.

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#powerbank #18650 #electronics #review #lifekaki