In this video, I reviewed a 1.5V lithium-ion rechargeable battery from XTAR (https://www.xtar.cc/product/XTAR-1.5V..., https://www.xtar.cc/product/XTAR-L4-C...) and analyzed how it works.

00:00 Overview
02:44 Specifications
04:55 Charging voltage, how does it work?
07:52 Principles of operation
09:34 Switching noise under load
12:32 Discharging/load testing
16:45 Measured battery capacity
18:02 Teardown/conclusions