| The ratio for 23T I think is from 1:5.1- 1:5.5   speed, running time and temperature are all related.   You had ran for 15 mins, if one package of battery can run 15mins, the playing time is outstanding for a 23T..   How was the speed, if the speed was as fast as a rabbit, so you got a perfect match.......  Temperature hot or extemely hot is quite difficult to define.  as long as not burnt, you got a good result!! 
 This is only my own opinion....
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