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Above PCB, https://www.keyelco.com/userAssets/file/M65p4.pdf Keystone type 2998 battery holder Keystone type 2998 battery holder Keystone #500, CR1220 battery holder, Memory Protection Devices P/N BA9VPC, http://www.memoryprotectiondevices.com/datasheets/BA9VPC-datasheet.pdf PP3 Battery Holder BH-331P Battery Type 3xAA Battery Holder 2479 Battery Type 3xAAA Keystone Battery Holder BH-331P Battery Type C Plug Shenzhen Jing Tuo Jin Electronics Co 918-118A2021Y40002 ( https://datasheet.lcsc.com/lcsc/1912111437_Jing-Extension-of-the-Electronic-Co--918-118A2021Y40002_C399939.pdf ) also compatible.

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