The battery performance is crucial for the reliability of solar garden lights, influencing their overall effectiveness. Key factors include cycle life, which determines how many charge-discharge cycles the battery can endure; high efficiency for better energy conversion; and self-discharge rate, which affects energy retention during inactivity. Additionally, temperature adaptability is essential, as extreme conditions can impair battery function. Safety performance is critical; quality batteries should include protections against overcharge and over-discharge. A robust charging control system enhances efficiency and safety by adjusting current based on light conditions. Lastly, selecting a battery with the right capacity ensures that solar garden lights provide adequate illumination for user needs.