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Diameter between 16-19 mm: https://www.keyelco.com/product.cfm/product_id/826 Keystone #500, 12mm CR1220 battery holder, http://www.keyelco.com/product-pdf.cfm?p=710 AA CR2 A battery holder Keystone 2xAAA cell battery CR-1025 coin cell cr1216 cr1220 cr1225 1xPP3 (9V) battery holder, Keystone P/N 2462, https://www.keyelco.com/product-pdf.cfm?p=1027 1xAAA Battery Holder, 2479, Battery Type 3xAA battery CR1225 coin cell retainer CR2032 BR2032 BatteryHolder Battery AA battery cell holder CR2032 retainer clip, SMT ( http://www.farnell.com/datasheets/1505853.pdf BC-2001 CR2032 2032 Battery Holder SMD Tactile Switch, B3SL Middle Stroke Tactile Switch, http://www.helloxkb.com/public/images/pdf/TS-1187A-X-X-X.pdf Ultraminiature Surface Mount Single Row 2.54mm (0.1 inch) Pitch PCB Connector, M20-89011xx, 11 Pins (http://www.farnell.com/datasheets/2157639.pdf), generated with kicad-footprint-generator Samtec HLE.