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Message: <blockquote data-quote="Smoggie" data-source="post: 171685" data-attributes="member: 5165">Maximum current (Amps) will occur when the battery voltage is at a maximum (i.e when it is fully charged). A decent battery fully charged will easily hold 3.7V per cell under load, so I'd use 11.1V  for the maximum Power (Watts) calculation. As the battery depletes voltage in the battery drops and current (Amps) will drop too. So you will have less watts/lb at the end of the flight compared with at the start of the flight, but that's just the nature of electric power.It's important when first using a new power setup to test it with a wattmeter to make sure you are staying within component ratings.</blockquote>