What the 1-cell fuel gauge does on the board
The MAX17262REWL+T is a single-cell fuel gauge IC from the ModelGauge series, designed to report remaining capacity and state-of-charge for LiFePO4 or Li-ion battery packs over an I²C bus. It monitors one series cell — the 1S configuration common in portable instruments, handheld scanners, and single-cell Li-ion packs — and communicates the fuel level digitally to the host microcontroller.
Package and board-fit for the 9-WLP
The 9-WLP (1.47x1.45 mm) wafer-level package is the smallest footprint for a fuel gauge in this class — the 9-bump array fits directly on the battery-side PCB or inside the pack assembly without a separate carrier.