Hi Guys,
I'm primarily an electric flyer so I am somewhat familiar with batteries used in this application. When I received my RAM 500 I saw the type of battery and immediately saw room for improvement. The KR 1400's are not ideal for higher amperage draws such as the Speed 300 sees during start. We're actually abusing that little motor pretty bad but they are cheap. The 1400's do show a good capacity for their size but the voltage gets quite depressed when there's more than a 10 A load on them. Even though the SCR 1250's have a lesser capacity rating, they are MUCH happier at that amp draw and will deliver more useful capacity than the 1400's. I have personally used the 1250 SCR type in applications that were drawing 90 A !! If you have the room and can carry the weight, by all means use RC or CP 2400's. I am using the CP1700's that are the same size and weight as the 1250's. The 1250's are older technology so can be had quite cheap.