NuVision TM800A510L Battery Replacement

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Use a Heat Gun to loosen the adhesive under the backing of the device.
Use prying tools to lift up the back of the device to get underneath.
I recommend concentrating on one side of the device at a time and making sure the device is 'almost too hot to touch' before you begin using the prying tools.
You can use either metal or plastic prying tools. Keep in mind, though, that metal ones may scratch the device.

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