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Durapro 1pc En-el11 En El11 D-li78 D Li78 Np-by1 Np By1 3.7v Li-ion Battery For Nikon Coolpix S550 S560 Pentax M50 W60 W80 V20 - Digital Batteries - AliExpress
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Pentax Optio S1 Battery and Charger with Car Plug and EU Adapter - Replacement for Pentax D-LI78 Digital Camera Batteries and Chargers (750mAh, 3.7V, Lithium-Ion) - Walmart.com
Pentax K-BC78U Battery Charger Kit 39746 B&H Photo Video