Nikon MH-21 Quick Charger for Nikon EN-EL4 and EN-EL4a Rechargeable Li-Ion Batteries Quick charger for Nikon EN-EL4 and EN-EL4a batteries Charges lithium-ion batteries in roughly 100 minutes Ideal for photographers who don't have time to waste Measures 4.9 x 1.5 x 2.9 inches (W x H x D); weighs 8.8 ounces See Product Description for details including limitations and what is not covered.