I put together some batteries in a series connection the current mAh is 750 how can i lower the mAh to 500?

Answer 1

750 mAh means that if you have a load that needs 750 mA, the battery (fully loaded) will last for one hour.

Obviously, if you give it a smaller load (500 mA) the batteries will last longer.

In other words, you can't lower the spec of the battery. Put a smaller load and it will last longer. Put a bigger load and it will last less.

Answer 2

use resiatnce in the circuit like a resistor or pot switch. when you design a circuit of any kind and need less you use a common resistor using OHMs law you can figure it out or just add another load another bulb ect.