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BackCR1220 battery holder, http://www.keyelco.com/product-pdf.cfm?p=710 AA CR2 A battery holder for 18650 cylindrical cells http://www.keyelco.com/product.cfm/product_id/918 Keystone type 3034 coin cell vertical Panasonic CR-2450/VAN battery, https://industrial.panasonic.com/cdbs/www-data/pdf2/AAA4000/AAA4000D492.PDF battery CR-2450 coin 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 with High Contact Reliability, Side-actuated Model, without Ground Terminal, without Boss Ultra-small-sized Tactile Switch with LCD screen K switch dual-pole double-throw DPDT spdt ON-ON horizontal MEC 5G single pole double throw D Switch, single pole double throw, separate symbols