Nikon MH-23 Quick Charger (UK) for EN-EL9 and EN-EL9a: Amazon.co.uk: Electronics & Photo
Amazon.co.jp: SIXOCTAVE Compatible Battery for Nikon EN-EL9 / EN-EL9a 2 Pack [Battery Indicator, Rechargeable with Genuine Charger, Can Be Used As Original Product] & Dual USB Rapid Compatible Charger Camera Battery Charger