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The 1S DC-DC BOOSTER is a DC-DC power booster module which can draw power from a 1S LiPo battery, then boosts it to the voltage level (6V) that suits the receiver & servo and provides continuous output current up to 3Amp. It is mainly applied in 1/12th scale RC vehicles. 1/12th scale cars usually use a 1S Lipo battery, and the BEC in an ordinary speed controller is a step down. In that case, the BEC output voltage will be lower than 4.2V and cannot meet the power demand of the receiver & servo.