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12v 18650 battery with bms but no balance. Can we use 3.7v output from it for powering bluetooth module directly? Answered

I am trying to make Boombox Speaker.

The amplifier is 12v and the bluetooth module is 3-5v input.

I have a single 12v BMS module, ofcourse with 4.2v, 8.4v, 12.6v dividers. Now suppose I power the amplifier with total output, it works fine. But can I take the output of one single divider i.e. 0-4.2v for the bluetooth module sepeartely and keep using the 12v for the amplifier?