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Panasonic Eneloop D Cell Spacer AA Battery Converters - 4 Pack
3x C-Size to 18650 Battery Adapter – Divecenter
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Amazon.com: EBL C Size Battery Adapters, AA to C Size Battery Spacer Converter Case Use with Rechargeable AA Battery Cells - 4 Pack : Tools & Home Improvement
EBL AA to C Size Spacer (Adapter/Converter)
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Battery Pack for C, EC, & Most Minox 35 Cameras, and Rollei-35-LED. Batteries are included.