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2 x Ex-Pro Battery NP-20 NP20 for Casio Exilim EX-Z60 EX-Z70 Z75 Z77 S770 S880 on OnBuy
Synergy Digital Camera Battery, Compatible with Casio Exilim EX-S770 Digital Camera, (li-ion, 3.7V, 630 mAh) Ultra High Capacity, Replacement for Casio NP-20 Battery : Electronics - Amazon.com