Backpack Tank Rechargeable Battery (4AH 21V)

Power your backpack pumping water tank with a battery built specifically for the job. This 21V 4.0Ah lithium pack delivers steady, reliable performance and keeps your pump running for approximately 3.5 hours on a full charge. A simple 4-light indicator lets you check your remaining power at a glance—no guessing, no surprises in the middle of a job. When it’s time to swap batteries, just press the quick-release button and slide it out. The fit is secure, removal is effortless, and the whole setup is designed to keep you working, not fighting with your equipment. Charging takes about 4 hours, and the battery is designed specifically to work with our Equipmaxx backpack pumping water tank. Note: Charger sold separately. Features 21V 4.0Ah lithium battery designed for Equipmaxx backpack pumping water tank Approximate runtime of 3.5 hours on a full charge 4-light LED display shows remaining battery charge at a glance Quick-release push button for easy slide-in/slide-o