To maximize the battery in The Legend of Zelda: Tears of the Kingdom, you need to collect 4,500 Crystallized Charges. This amount is crucial for enhancing the gameplay and unlocking new possibilities within the game.
Initially, the batteries are green. Upgrading them requires 2,100 crystallized charges. After this upgrade, you can further enhance the batteries by doubling their capacity, changing their color to blue. This second upgrade needs an additional 2,400 crystallized charges, totaling 4,500 for full maximization.