The Bosch 18 V 2.0 Ah compact battery is the lightweight member of the Bosch Professional 18 V platform. Its 2.0 Ah capacity gives shorter runtime than higher-Ah packs but is noticeably lighter — on overhead work, long screwdriving sessions and in tight spaces, that difference reduces hand and arm fatigue. Platform compatibility is the real value here: it works with every Bosch Professional machine on the same 18 V system. Keeping one alongside a high-capacity pack is a common professional approach — the large battery for heavy work, the compact one for precise, sustained tasks. Compact batteries also change the balance of the tool; on small screwdrivers in particular, a lighter base gives a more balanced grip.