Nikon EN-EL3a Rechargeable Lithium-Ion Battery Pack for D50, D70, D70s, and D100 Works with Nikon D50, D70, D70S, and D100 cameras Lithium ion chemistry free from memory effect 1500-mAh power capacity Compact 1.62-by-2.25-by-0.81-inches, weighs 4-ounces Charger not included; 30-day warranty