The lithium high-power compact battery packs: Effortless work thanks to the weight of 600 g. This makes it 20% lighter and 50% more compact than a 5.2 Ah battery pack ? saving on weight, but not on performance. Thanks to the lithium high-power cell technology, it is powerful enough for every application. And, of course, with Festool Service, the product is completely covered.?Effortless work: At just 600 g, it is 20% lighter and 50% more compact than a 5.2 Ah battery packFull power: Thanks to the Li-HighPower cell technology, it is powerful enough for every applicationExtremely durable: The high-current-resistant cells ensure durabilityFor stress-free work: The battery packs are, of course, completely covered with Festool Servicewith AIRSTREAM functionlithium-ion (Li-ion) replacement battery pack for all Festool 18 V cordless tools (except CXS, TXS, ETSC 125, RTSC 400, DTSC 400)