Charging time, chip fever?

[MuTong]

When charging, the chip is hot.Can be normal use.9.2v,Chip heating is caused by low voltage?
Battery selection, 25C / 20c / 30C / 35C?What are the requirements for battery selection?

[blueridgedog]

You need to sustain 23 amps.  So, the C rating will be dependent on the capacity of the pack.  A 900mAh pack will have to have a higher C rating than a 1800mAh pack.  For a 900mAh pack, .9wH * X = 23, or 23/.9 = X or 25.5 C.  A 1800mAh pack would require 1.8wH * X = 23 or 23/1.8 = X or 12.7 C.  

A good way to think of it is to use a 100mAh pack (1wH).  To get 23 amps would require a 23 C rating.  If you go up in capacity, you drop the C rating required (in half for a 2wH pack) or double for a 500mAh pack.