[Al Skierkiewicz]

Guys,
There are two power supplies on the PD, one for the cRio and the other for the radio. while similar in design these are separate supplies. They will stop operating when the battery voltage input to the PD falls below 4.5 volts. Since they are separate supplies they may stop at different times. Loose battery connections, poor crimps, loose hardware on the battery and a bad SB50 connector can all contribute to losses that will shut down these supplies. However, even these supplies cannot stay up with no power to the robot. So, as inspector and electrical guy, I work this list...
1. Are the terminals on the battery tight and non-moving? Typical of carrying the battery by the wiring. Cannot be repaired, battery is likely candidate for recycling.
2. Do the wire terminals rotate on the battery terminals? Typical for these battery terminal types. The simple addition of a star washer between the terminals will prevent this.
3. Is the hardware tight on the PD? Tighten using metric nut driver.
4. Is the hardware tight on the main circuit breaker? Tighten using english nut driver.
5. Is the wire secure in the terminals used? Tighten and strip to correct length if needed. SLA connector in particular have an optimum strip length that is needed for secure electrical connection.
6. Is everything correctly insulated? Electrical tape, not duct tape is your electrical friend.