Nikon EN-EL9 Rechargeable Lithium-Ion Battery (7.4v, 1000mAh) for Nikon D40 and Nikon D40x SLR Digital Camera
Amazon.com : 2x Pack - Nikon EN-EL9 Digital Camera Battery and Charger Replacement with Car & EU Adapters (1300mAh, 7.4V, Lithium-Ion) - Compatible with Nikon D3000, D5000, D40, D60, D40X, EN-EL9, EN-EL9a,
HIBTY 3Pcs EN-EL9 2400mAh Ultra High Capacity Li-ion Battery Pack for Nikon D40 D40x D60 D3000 D5000 Digital SLR Cameras - AliExpress
HL-EL9a (EN-EL9)
Kastar 2-Pack EN-EL9a Battery Replacement for Nikon EN-EL9 EN-EL9a Battery, Nikon D5000 SLR Digital Camera, D40 SLR Digital Camera, D40X SLR Digital Camera, D60 SLR Digital Camera, D3000 SLR Camera - Walmart.com
Buy Nikon EN-EL20a Rechargeable Lithium-Ion Battery Pack (7.2V, 1110mAh) - National Camera Exchange
Nikon MH-23 Battery Charger Charger for Nikon EN-EL9 lithium ion battery at Crutchfield