1. In the game, the ability to resist the algae cross can provide a shield effect for other characters in the team, increase the defense, and restore certain health points for teammates.

2. Shields are usually used in games to provide extra defense capabilities and help the characters in the team reduce damage when attacked by the enemy. The word battery means that skills can provide energy or resources for other characters, similar to batteries providing power for devices. Therefore, the skill of jade cross is called "shield battery" to highlight the visual description of the ability to provide defense and support in the game.