HiFei Capacitor Bank Specification:

Hifei Capacitor Bank for Brushless Esc's

63 volt Capacitors. Recommended for up to 12s Maximum.

It is generally reported that capacitor failures can be attributed to:
1) Heating, causing a capacitor to swell and explode.
2) Drying of the liquid electrolytic inside from various causes, such as defects, leaking and even cleaning.
3) Capacitors re-form over time to meet a usual and expected voltage. Surges that are not normal can cause sudden failure.
4) The older they get the greater the incidence of failure.
5)High-current motor setup will tend to kill the caps quickly (because of the large voltage changes).

WARNING: If any capacitors seem to bulge, start to deform, leak or pop, stop using them IMMEDIATELY!!! If Capacitors fail they can explode and cause injury.