STK EN-EL9 EN-EL9a Battery for Nikon D3000, D5000, D40, D60, D40X STK's Nikon EN-EL9a Battery Pack is made with # 1 Japanese cells. 100% OEM Compatible - Complies with or exceeds Nikon OEM EN-EL9a battery specs Guaranteed to operate with your Nikon EN-EL9 or EN-EL9a SLR camera. CE Safety Certification. SterlingTek's Nikon EN-EL9a battery is warranted for 12 months.