Originally Posted by FedericoA
So what is the poupouse of use a 20c or a 30c instead,,,,?
Without getting into a bunch of other related items like internal resistance, manufacturers overrating their cells, etc...
Roughly, the C rating times the mAh of the battery is the maximum continuous draw the battery can handle.
ie... 20c 2000mAh would be good for 40A sustained; 30c 2000mAh is good for 60A sustained, etc.
Since you're pulling considerably less than 40A sustained with the T-28, a 20C battery is fine for that application.