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BackCell cr1216 cr1220 cr1225 1xPP3 (9V) battery holder, Memory Protection Devices P/N BA9VPC, http://www.memoryprotectiondevices.com/datasheets/BA9VPC-datasheet.pdf PP3 Battery Holder 18650 Battery Holder BA9VPC 9V 2xAA cell battery holder, http://www.keyelco.com/product-pdf.cfm?p=710 AA CR2 A battery holder Keystone type 3001 coin cell battery holder, http://www.keyelco.com/product-pdf.cfm?p=710 Battery holder for 18650 cylindrical cells http://www.keyelco.com/product.cfm/product_id/918 Keystone type 3001.