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BackSpring, Keystone, https://ken.keyeuro.eu/cat/590.pdf AA battery cell holder Keystone type 3034 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 vertical Panasonic CR-3032/VCN battery, https://industrial.panasonic.com/cdbs/www-data/pdf2/AAA4000/AAA4000D508.PDF battery CR-3032 coin cell vertical Panasonic CR-1632-V1AN battery, https://industrial.panasonic.com/cdbs/www-data/pdf2/AAA4000/AAA4000D464.PDF battery CR-1632 coin cell retainer CR2032 BR2032 BatteryHolder Battery AA battery cell holder Keystone 2xAAA cell battery holder, Keystone P/N 2468, http://www.keyelco.com/product-pdf.cfm?p=1033 AAA battery cell holder 2xAA cell battery holder, Keystone P/N 2462.