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BackMm: 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 for CR1216/1220/1225, https://linxtechnologies.com/wp/wp-content/uploads/bat-hld-012-smt.pdf battery holder for 18650 cylindrical cells http://www.keyelco.com/product.cfm/product_id/918 Keystone type 3000 coin cell retainer CR2032 BR2032 BatteryHolder Battery AA battery cell holder Keystone #500, 12mm CR1220 battery holder, http://www.comf.com.tw/ProductDetail.asp?no=148 Keystone type 3008 coin cell vertical Panasonic CR-2450/VAN battery, https://industrial.panasonic.com/cdbs/www-data/pdf2/AAA4000/AAA4000D492.PDF battery CR-2450 coin cell vertical Panasonic CR-3032/VCN battery, https://industrial.panasonic.com/cdbs/www-data/pdf2/AAA4000/AAA4000D508.PDF battery CR-3032 coin cell retainer Keystone 3034 SMD battery holder Keystone SMT (Auto-In/Ultra-Low) Holder for 2032 Cell, 33.2 x 23.9mm, 2mm height above PCB, https://www.keyelco.com/userAssets/file/M65p4.pdf Keystone type 3000 coin cell retainer BR2016 CR2016 DL2016 BR2020 CL2020 BR2025 CR2025 DL2025 DR2032 CR2032 DL2032 Keystone type 3001 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 Keystone SMT (Auto-In/Ultra-Low) Holder for 2032 Cell, 33.2 x 23.9mm, 2mm height above PCB, https://www.keyelco.com/userAssets/file/M65p4.pdf Keystone type 3000 coin cell holder 2xAA cell battery holder, Memory Protection Devices P/N BC12AAPC, http://www.memoryprotectiondevices.com/datasheets/BC12AAPC-datasheet.pdf BC2003 CR2032 2032 Battery Holder SMD Tactile Switch, B3SL Middle Stroke Tactile Switch Ultra-small-sized Tactile Switch with LCD screen K switch normally-open pushbutton push-button Lamp D Push button switch, push-to-open, generic, two pins | | | | | | | | | | | | | | J3 | 1 | 2_pin_Molex_connector | 2 | 4.7k | Resistor | | | R9, R11, R13 | 3 | AudioJack2 | Audio Jack, 2 Poles (Mono / TS), Switched T Pole (Normalling)