RIDGID 18V Lithium-Ion 4.0 Ah Battery (2-Pack) AC87004P - The Home Depot
20V Max vs 18V Batteries: Setting the Record Straight - Pro Tool Reviews
18V XRP™ Battery Pack | DEWALT
DEWALT 18-Volt 2-Pack 2.4 Amp-Hour; 2.4 Amp-Hour Nickel Cadmium (Nicd) Power Tool Battery Kit in the Power Tool Batteries & Chargers department at Lowes.com