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Pentax Optio M50 Battery - Replacement for Pentax D-LI78 Digital Camera Battery (750mAh, 3.7V, Lithium-Ion) - Walmart.com
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TWO 2X D-LI78 D-L178 Batteries for Pentax Optio M50, Pentax M60 S1 V20, Pentax W60, Pentax W80 Digital - Newegg.com
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