Which one is better?

The NanoFoamer Lithium runs on 3.7V Lithium-Ion battery and drives the impeller at 4k RPM when fully submerged. Brand new Eneloop Pro batteries will provide only 3V of power and drive the impeller to a maximum of 3k RPM when fully submerged. So the Lithium will always be more powerful than even the best AA batteries on the market. In fact, the Lithium has two speeds and the slow speed of the Lithium is about equal to the fastest speed of the V2.
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