BUY SA9259 https://www.utsource.net/itm/p/971362.html
5-CH BRL DRIVER FOR CD PLAYER WITH 5V OUTPUT VOLTAGE
Description: The SA9259 is an IC designed for the protection of lithium-ion batteries. It is a high-performance battery protection IC with an overcharge, over-discharge, over-current, and short-circuit protection. Features: - Overcharge protection voltage: 4.2V ± 0.025V - Over-discharge protection voltage: 2.5V ± 0.1V - Over-current protection voltage: 2.5V ± 0.1V - Short-circuit protection voltage: 0.2V ± 0.1V - Operating temperature range: -40°C to +85°C Application: The SA9259 is suitable for use in lithium-ion battery protection circuits, such as mobile phones, digital cameras, and other portable electronic devices. (For reference only)