Lord Fear... read my posts from yesterday. I explained the extent to all of the Heralds and GLs powers. Here is a recap:
GLs are all capable of the speed of light... some that have stronger wills can go faster. SS is the only Herald that can go the speed of light. The next fastest Heralds are Airwalker and Firelord who travel just under lightspeed.
Heralds and GLs have Cosmic Power... Heralds do not have infinite Cosmic Power because then that would put them on the same level as Galactus. The were all given a portion of the Power Cosmic.
Now not all GLs rings need to recharge. Alan Scott got rid of his ring and yet still had GL power... noone is sure why but they think it was because he had that power ring that had some ancient GLs spirit in it that made it magic. Kyle Rayners ring does not need to charge as often. It is able to hold more power. Then there is John Stewart who does not need to charge his ring anylonger from the Central Battery because he has the powers of a Guardian.
Now Nova is only capable of lifitng 2 tons. Terrax 75 tons. Firelord 50 tons. Airwalker (as storng as the Thing) 70 tons. Silver Surfer 100 tons. I dont know about Morg or Stardust.
If you are going to use Morg with the water of life... then you should be able to use the Parallax form of Hal.
GLs can rearrange molecules also... can animate inanimate object, make exact replicas of themselves, etc. They can even go through time.
Normally GL rings do have to recharge that is true but only after 24 hours. They do not run out of energy within that 24 hour time. They are time based not based on how much energy they use. So for 24 hours they have an almost infinite amount of energy.