Amazon.com : Synergy Digital SDNP20 Lithium-Ion Battery - Rechargeable Ultra High Capacity (3.7V 630 mAh) - Replacement for Casio NP-20 Battery for Casio Exilim EX-M1, EX-M2, EX-S1, EX-S1 PM, EX-S100 : Electronics
Amazon.com : Kastar NP-20 / NP20 Battery Charger Compatible with Cas Exilim EX Series Cas Exilim NP-20 NP20 Battery for Exilim EX-M1, EX-M2, EX-M20, EX-S1, EX-S2, EX-S3, EX-S20, EX-S10 : Digital Camera
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Promaster Casio NP-20 Lithium-Ion Battery For use with Casio - BRAND N