Power Sources have no stats of their own. They will modify INFUSIBLE equiped items stats, wich as far as I know only includes Energeiac gear. The gear will drain power from the orb until it is empty and the orb cannot be recharged. If you only have 1 weapon and no other INFUSED gear the power source will hold for roughly 47 hours, if you add a shield it drops to 24, and again for each additional piece of equipment.
The orb stats modifs are static for any piece of equipment regardless of the REC level or Purity.
Murky Air Orb:
AC: -1
HP: -15
END: -15
STR: -4
STA: -4
AGI: +4
DEX: +4
CHA: +2
FIRE +3