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To determine how long an 8 Ah (amp-hour) battery will run a 4-watt pump, you first convert the pump's wattage to amps. Since power (watts) is equal to voltage (volts) multiplied by current (amps), and assuming a common voltage of 12 volts, the pump draws about 0.33 amps (4W / 12V). Therefore, an 8 Ah battery can run the pump for approximately 24 hours (8 Ah / 0.33 A ≈ 24 hours) under ideal conditions, not accounting for efficiency losses or battery discharge characteristics.

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4mo ago

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