Never needed a booster pack or extra reciever battery with this speedo. Its rated as working from 3.2v upwards so its fine for 1S lipo and has worked now for 4 month with out any extras. The orginal version 1 was rated at 4.8v and higher. I didnt see a red on the esc but with version 2 printed on the side i think it fair to say it the new type with the latest software.
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