Sorry still not sure how to calculate all this power stuff, if you could help with that part too id appreciate it

Lets see if I can get this right;

Power is measured in joules (J).

But obvioulsy you can apply power over a long time or over a short time.

Energy is measured in watts (W).

A watt is a joule/s i.e. it is a measure of how fast power is being supplied.

Electric charge is measured in coulombs (C)

Electric potential is measured in volts (V).

A volt equates to a J/C

Current is measured in amperes (A).

An ampere is a coulomb/s C/s

From the above you can see that 1V x 1A

is 1J/C x 1C/s or 1JC/Cs or 1J/s i.e. 1W

(so volts times amps gives watts)

When looking at batteries you want to know how many amps they can supply for how many hours.