Originally Posted by js058515

"Low voltage cut-off protection: If the lithium battery pack’s voltage is lower than the threshold for 2 seconds, the ESC will cut the output power. Please note that the ESC cannot be restarted if the voltage of each lithium cell is lower than 3.5V. You can disable cutoff voltage protection function for competition racing.

For NiMh/NiCd battery packs, if the voltage of the whole NiMh/NiCd battery pack is higher than 12V, it will be considered as a 4 cell lithium battery pack; If it is higher than 9.0V but lower than 12V, it will be considered as a 3 cell lithium battery pack; If it is lower than 9.0V, it will be considered as a 2 cell lithium battery pack. For example, a NiMh battery pack is 8.0V, and the threshold is set to 2.6V/Cell, so it will be considered as a 2 cell lithium battery pack, and the low-voltage cut-off threshold for this NiMh battery pack is 2.6*2=5.2V."

Source: Cirtix series Brushless Motor Speed Controller manual “V1.1-5222010a”