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Re:Ask HN: How to keep water-obsessed autistic child from wa... by kortex on Friday July 22, 2022 @05:17PM (#32197235)
They actually make pumps that run off of power tool batteries. No rigging required. E.g. RYOBI One+ 18V Hybrid Transfer Pump P750

They also make battery-to-12VDC adapters, and there are plenty of 12v barrel jack fountain pumps.

Don't even have to break out the soldering iron!

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