"Spin Attack charges quickly"
The Charge Ring is a Magical Ring that Link acquires in Oracle of Seasons and Oracle of Ages. Link can acquire the ring by planting a Gasha Seed and finding it within a Gasha Tree. Link can also acquire it in a Seed Ring gained by bumping into Maple.
When Link wears the Charge Ring, he is able to charge his Spin Attack four times faster than normal. This ring is very useful in Boss battles late in the quest where the Spin Attack is required. Particularly, the ring works very well in the battle with Onox, as well as the Linked Game ending battle with Ganon. These bosses cannot be damaged by the Noble Sword, so Link needs to use the Spin Attack if he hasn't already acquired the Master Sword.