Higher "C" ratings equate to higher power (current draw) without making 'tacos' out of your batts.
1800ma @ 10C = 18A - - @ 20C = 36A - - @30C = 54A
For a 4-cell LiPo that means 266.4 watts for a 10C, 532.8 watts for 20C, and 799.2 watts for 30C
using 14.8 as ref voltage. Rough estimate can be calculated for your plane by using Moto-Calc or
equivalent software. Better yet measure it with a power meter, and buy accordingly. I like at least
a 30% margine, a fully charged 4-cell pack is 16.8V so initial spool up can (and will) draw more
current than the above averages.