I need my Arduino Nano, MPU6050 and HC05 to be supplied by batteries
any advice on that like how many batteries and how many volts
Nano - 5v to 15v
MPU6050 - 3v
HC-05 - 3v
"How many batteries" depends on battery capacity and time of use.
Be specific. Links to, or pictures of the exact products.
Which Nano. There are several completely different ones. 5volt logic and 3.3volt logic.
Which PMU6050 board. Some have voltage regulators and level converters, others don't.
The required voltage of the HC-05 is written on the back. 3.6volt to 6volt.
That one can usually be powered from the 5volt pin of a classic Nano v3.
I would not power a classic Nano with more than 9volt if it has to power sensors/BT.
Leo..