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The First step Dry the bottom of the baby bath thermometer( If do not press any buttons, the device will automatically shut down after 15 minutes.) The Second Step Hold down the small dot at the bottom of the bathtub thermometer and rotate the lid. The Third Step Remove the battery cover (note the waterproof gasket inside) The Fourth Step Press the battery to eject it automatically.(Keep small parts such as batteries out of the reach of children when disassembling the battery.)