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I struggle to understand voltage and wattage so I need help. I have a Wisper 705 with a 375 w battery and want to charge it from the cigarette lighter but I'm paranoid about putting in the wrong power and frying the battery. I have a 5 volt, 500 mA inverter that plugs in to the lighter socket...

thank you all for your advice, I have spoken to David at Wisper and we have done a deal involving good old British pounds

Hi, I have had a stroke and therefore my right hand is weak. I had a Powabyke X bike but I found it quite uncomfortable on tracks and the throttle was on the wrong side and, when moved, was inconvenient I like the look of the Wisper 705 and Whispers reputation is good. I have a budget of about...