STK’s Nikon EN-EL9 / EN-EL9a Battery – 1400mAh for Nikon D3000, D5000, D40, D60, D40X. STK’s Nikon EN-EL9a Battery pack (SterlingTek Trademark) was designed to meet or exceed the OEM mAh capacity. Our company has strived very hard in order to supply you with the highest quality Nikon EN-EL9a replacement battery on the market. 1 Year Total Warrantee: We will exchange this as well as any other product which you decide to buy from us for 1 year from the day your purchase is processed if it fails under regular wear or is defective. We always sell brand-new great quality products and we are willing to back them up.