Save over $400 on the Roomba j7+ and finally retire your old vacuum
As of Jan. 28, the iRobot Roomba j7+ robot vacuum is on sale at Best Buy for $359 ($440 off). With smart mapping and a ...
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China’s lithium-air battery breakthrough achieves 960-hour life, 95.8% efficiency
Researchers develop a catalyst boosting lithium-air batteries with 0.52V, 960-hour stability, and 95.8% efficiency, advancing ...