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I have a ryobi air pump that runs off their lithium ion batteries. I actually have 2 of them. 18V ONE+™ DUAL FUNCTION INFLATOR / DEFLATOR | RYOBI Tools

They have a few other models. I keep one in my car and the other in my wife's. Use them for bikes as well as balls just keep them in the trunk and swap the batter to charge in the house every few months when I think about it. What I really like is I can set a pressure and it'll inflate to that +1 then turn off automatically. Seems pretty accurate from what I have tested.
 
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