What is that small button battery by the earpiece?

I took apart the LCD screen and saw a button battery next to the earpiece. Do I need to replace the battery? The phone is 7 years old so the battery must be low.

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That could be your RTC battery. Post an image with your question so we can make sure. This guide Adding images to an existing answer will show you how to add images.

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You can see the small battery in the upper left corner of Steps 6 and 7 of the following repair guide:

Motorola Razr V3 LCD Screens and Call Speaker Replacement

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Yes, that is the RTC battery. Since you already have your phone open, I would most certainly replace it as well.

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