The BOSCH GBA18V40 18V CORE18V Lithium-Ion 4.0 Ah Compact Battery is a lightweight, high-capacity power source built for Bosch 18V tools. It's designed to stretch runtime without weighing you down—power, not a portable gym session.

Key Features & Design

• Compact 4.0 Ah capacity — delivers 2X the runtime compared to the previous generation BAT612 2.0 Ah battery.
• Lightweight performance — weighs only 1.10 Lbs, giving you serious power without the buffoonery of extra weight.
• 21700 cell technology — single-layer design with enhanced 21700 cells for greater battery efficiency, matching the power of the original two-layer 4.0 Ah battery with improved per-cell performance.
• Bosch-exclusive CoolPack 2.0 — heat-management system cools the battery 15% faster and provides 135% longer lifetime versus previous non-CoolPack 18V batteries.
• High-power Li-ion cells — copper end plates, power rails and a flexible circuit board reduce resistance and boost efficiency.
• Flexible power system — truly compatible with a full range of Bosch 18V Li-ion cordless tools.
• Specifications at a glance — Amp-hour 4; Battery Charger Included No; Battery Chemistry Lithium Ion; Battery Package Count 1; Battery Voltage (V) 18; Compatibility Bosch 18 V Lithium Ion Tools; Rechargeable Yes; Warranty Limited 1 Year; 2 Years with ProVantage.