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Negative battery contact Keystone type 3009 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 2xAA cell battery holder, http://www.comf.com.tw/ProductDetail.asp?no=148 Keystone type 103 battery holder coin cell vertical.

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