BUY DS2726+ https://www.utsource.net/itm/p/9386424.html

Package: QFN Manufacturer: Maxim Description: The DS2726+ is a battery fuel gauge IC that accurately measures the remaining capacity of a single-cell Li-ion or Li-polymer battery. Features: Accurately measures remaining capacity of a single-cell Li-ion or Li-polymer battery Automatically compensates for temperature and aging effects Measures current up to 1.5A Low-power operation Programmable alarms Compatible with Maxim's 1-Wire protocol Applications: Smartphones Wearable devices Tablets Notebooks IoT devices (For reference only)