1A is always 1A no matter voltage, mean if you have a charge of 1A during one hour you have 1A/h, but this is capacity that battery will need to supply.

How will you have 48W passing across a resistor of 3W??

To us, if you have 1A in 48V you is wasting 48W to show your robot have link in?? This is more than a RS550 in continuous work. Redesign this, use a single led 1W with a resistor of 2.5kohm.