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BNL3- 3 Volt Lithium Battery
https://www.branom.com/shop/bnl30000-bnl3-3-volt-lithium-battery-531036
https://www.branom.com/web/image/product.template/531036/image_1920?unique=c26756c
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This battery is used for the G306K and G308K. It is a lithium coin battery type CR2032.