SunZi Products Inc.SunZi PT04101-11 4V Lithium-Ion Pistol/In-Line Drill/Driver w/LED Light Battery: 4V Lithium-Ion No-Load Speed: 200 RPM Lithium Ion enables long runtimes and fade-free power. Lithium Ion batteries will also offer long battery life and long storage life (4x Ni-Cad) Pistol Grip or In-Line Use for any Hard to Reach Angle or Position 1/4" Collet with Magnetic Bit Holder