Perfect complement: Thanks to Li-HighPower cell technology, the Li-HighPower battery packs are powerful enough for any application and compatible with all Festool battery products. Comfortable: Weighing less than 600 grams, the included Li-HighPower Compact battery packs are 20% lighter and 50% more compact than a standard 5.0 Ah battery pack. Automatic extraction start: The Bluetooth battery packs automatically start a paired extraction unit when the tool is turned on. Smart expansion: The Festool WorkApp, in combination with the Bluetooth function of the battery pack, enables clever additional features, such as detailed display of the charge level and other operating data like temperature or charge cycles. To quickly and easily identify the battery with the lowest charge, the LED display on the battery pack can blink. Software updates are also possible: Install the latest version to always work with the newest features of the tools. Charge two simultaneously: The DUO fast charger charges two battery packs at the same time. It is suitable for all battery packs in the 10.8 V, 14.4 V, and 18 V classes (exception: BP-XS for CXS/TXS 10.8 V). Separate LED displays at both charging slots provide information about the current charge level of each battery pack at any time. Neatly organized: Packed in a Systainer with enough space for a total of four battery packs and the DUO fast charger. Mobile: Packed in a Systainer, the energy Systainer can be easily integrated into vehicle setups for simple transport from the workshop to the construction site. Better in the system: Systainers are compatible with each other and can be linked with all previous generations of Systainers.