Don't worry about the C rating for your pump. The rating becomes critical when you are pulling high amps, such as electric RC brushless motors. I have some 400 sized brushless motors that can pull up to 40 amps with the right speedcontroller. The packs I've run for the FF and bilge were 20 C 11.4volt packs, I can't remember the Mili amp hours, but somewhere in the 4000 range. Expensive batteries. If I remember correctly, the C rating is applicable to the charge rate as well, so depending on how fast you want to charge the pack, get the proper C rating for a fast charge.
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