The TD06 battery is a widely compatible 6-cell lithium-ion replacement battery designed for various HP EliteBook and ProBook business laptops, including the 6930p, 8440p, 8440w, 6440b, and 6550b models. These batteries generally operate at 10.8V or 11.1V and feature capacities usually ranging from 4400mAh to 5200mAh (55Wh), providing a reliable power source for these legacy business workstations.