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Battery types of 2.9/4.2/7.5-inch Displays

2.9/4.2-inch Display: Battery Replacing Type. 1 Year Standby.
– 2.9-inch Display: AA battery
– 4.2-inch Display: CR 3032

7.5-inch Display: 4000mAh Rechargeable Polymer Battery. It only takes 4 hours to be fully charged, and lasts for about 1 year.

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