Bosch® CORE18V™ 18-Volt Lithium-Ion 8.0Ah Battery at Menards®
Amazon.com : SHGEEN 2Pack 5.0Ah Li-ion Replacement for Bosch 18v Battery BAT609 BAT609G BAT618 BAT618G BAT619 BAT619G BAT622 BAT620-2PK SKC181-202L for 18v Bosch Battery : Tools & Home Improvement
Bosch 18-Volt 2-Pack 8 Amp-Hour; 8 Amp-Hour Lithium Power Tool Battery Kit ( Charger Included) in the Power Tool Batteries & Chargers department at Lowes.com