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BackCR-3032/VCN battery, https://industrial.panasonic.com/cdbs/www-data/pdf2/AAA4000/AAA4000D508.PDF battery CR-3032 coin cell battery holder, http://www.keyelco.com/product-pdf.cfm?p=710 AA CR2 A battery holder Keystone type 3009 coin cell.
- SMD 2225 (5664 Metric), square (rectangular) end terminal.
- D35, but other options exist. Single-step button.