MOS Reference: Precision coulomb counting battery monitor with shunt-based current measurement for accurate state-of-charge tracking. High-side shunt resistor measures bidirectional current flow to calculate remaining battery capacity by integrating charge and discharge ampere-hours. Large LCD displays voltage, current, power, remaining capacity percentage, and time-to-empty estimates. Programmable alarms for low voltage and capacity thresholds. Far more accurate than voltage-only battery gauges for lithium and lead-acid systems.