Dual-Function 140W PD3.1 Power Hub: Combines high-speed battery charging and portable power delivery in one compact unit-charges BL1820B/BL1830B and other compatible lithium batteries at up to 28V5A, while also supplying up to 140W output to laptops, tablets, and smartphones via USB-C or USB-A. Real-Time Battery Status Display: Built-in digital screen shows precise remaining charge percentage of connected batteries, so you always know exactly how much power is left before heading to the jobsite or workshop. Compact Transparent Industrial Design: Measures only 3.7 x 2.3 x 1.5 inches-about one-third the size of a standard charger-with a sleek transparent casing that reveals internal components for visual confidence and intuitive diagnostics. Smart Bidirectional Charging: Supports bidirectional power flow: delivers up to 9A for peak current for fast battery replenishment, and draws power efficiently from compatible USB-C PD sources for flexible recharging . Wide Compatibility with Professional Batteries: Works seamlessly with BL1820B, BL1830B, BL1840B, BL1850B, BL1860B, and other lithium-ion batteries in the same voltage class-perfect for contractors, DIYers, and field technicians who rely on cordless tool ecozystems.