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The sprinker timer uses a solar-rechargeable lithium battery as its primary power source, which automatically charges via the built-in solar panel when exposed to sunlight, eliminating frequent battery swaps for most users. For extended cloudy days or low-light environments, you can add 3 AAA batteries (not included) as a backup to ensure uninterrupted operation. The low-power alert and auto-shutdown feature also prevent valve leaks from dead batteries, and the timer retains all your programmed settings even during power outages.