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BackCell holder CR2032 retainer clip, SMT ( http://www.farnell.com/datasheets/1505853.pdf BC-2001 CR2032 2032 Battery Holder BH-331P Battery Type 3xAA Battery Holder (http://www.memoryprotectiondevices.com/datasheets/BK-18650-PC2-datasheet.pdf Keystone Battery Holder, BX0036, Battery Type 3xAAA Keystone type 2998 battery holder Keystone type 3000 coin cell Panasonic CR-2477/VCN battery, https://industrial.panasonic.com/cdbs/www-data/pdf2/AAA4000/AAA4000D502.PDF battery CR-2477 coin cell vertical Panasonic CR-2354/VCN battery, https://industrial.panasonic.com/cdbs/www-data/pdf2/AAA4000/AAA4000D486.PDF battery CR-2354/VCN coin cell retainer Keystone 3034 SMD battery holder coin cell battery holder, Memory Protection Devices P/N BA9VPC, http://www.memoryprotectiondevices.com/datasheets/BA9VPC-datasheet.pdf PP3 Battery Holder SMD Tactile Switch, B3SL Middle Stroke Tactile Switch for High-Density Mounting, 4.3mm height, https://omronfs.omron.com/en_US/ecb/products/pdf/en-b3fs.pdf C&K Components SPST SMD PTS645 Series 6mm Tact Switch with High Contact Reliability, Top-actuated Model, without Ground Terminal, without Boss Ultra-small-sized Tactile Switch with High Contact Reliability, Top-actuated Model, without Ground Terminal, with Boss Ultra-small-sized Tactile Switch Ultra-small-sized Tactile Switch with Pegs, https://www.ckswitches.com/media/1462/pts125.pdf Button Tactile Switch with High Contact Reliability, Top-actuated Model, without Ground Terminal, with Boss Ultra-small-sized Tactile Switch Ultra-small-sized Tactile Switch for High-Density Packaging with Ground Terminal, with Boss Ultra-small-sized Tactile Switch with High Contact Reliability, Top-actuated Model, without Ground Terminal, with Boss SPST button switch OFF-(ON CMOS General Purpose Timer, 555 compatible, PDIP-8"/>