HOW LONG DOES THE 3V MOTHERBOARD BATTERY LAST?

It does not make a difference if it is dead or not. It should take max 3-6 hours to charge to full power even if you've have battery on the left. There is a big difference in how long it will end. There is a standby mode when you aren't using it which most phones last up to several days 3 max. But if you use it a lot battery will die a lot quicker.

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