The Festool Energy Set SYS 18V 4x HP 5.0/TCL 6 DUO is a battery-and-charger kit for the Festool 18V cordless platform, built for users who need more runtime and faster battery rotation across multiple tools. It includes four 18V HighPower 5.0Ah battery packs, delivering strong, consistent output with up to 50% more power than a standard 5.0Ah battery on select high-demand tools. The included TCL 6 DUO Rapid Charger charges two batteries simultaneously, and Bluetooth-equipped battery packs can automatically start a paired Festool CLEANTEC dust extractor when a cordless tool is switched on. Everything is stored in a Systainer3 SYS3 M 187 for organized transport. The set is compatible with most Festool 18V devices, with exceptions for the ETSC 125, RTSC 400, DTSC 400, and CTC SYS.