Regular Shields will regenerate only when one directs power from a new source and effects repairs.
Regenerative Shield technology barrows off a device which automatically can reconfigure the shields, divert power from key select non essential systems and effect a few light repairs to the shield emitters.
That is Regenerative shields.
It can also reproduce small amounts of energy..
Other abilities and these depend on the model being used by the ship...
corrected typos ...
But I also largely agree with this statement.
I would also like to add that it's possible how the Prometheus is utilizing incoming weapons fire as a way to replenish the shields on a continuous basis (although this type of technological use was never really stated on screen to begin with ... perhaps post Nemesis).