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Li-ion Battery for Fuji NP-50
Amazon.com: Replacement for Fujifilm NP-40N Battery - Compatible with Fujifilm NP-40 Digital Camera Battery (750mAh 3.7V Lithium-Ion) : Electronics
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Amazon.com : NP-40 Lithium Battery - Rechargeable Ultra High Capacity (710 mAh) - replacement for Fuji NP-40, Pentax D-LI8 & Panasonic CGA-S004 , Minolta NP-1 Battery : Digital Camera Batteries : Electronics
Batteries N Accessories BNA-WB-NP40 Digital Camera Battery - li-ion, 3.7V, 710 mAh, Ultra High Capacity Battery - Replacement for Fuji NP-40 Battery - Walmart.com