C1310 and all lights on

There is a very high likelihood that you would have a HV battery failure. You might need to have a better code reader to read all the codes on the Prius.

As the battery ages and you let your car sit, the battery modules will self discharge at different rates and become unbalanced, and often leading to failed cells.

 

The C1310 is set in the brake ECU because it has been notified of some issue by the hybrid-vehicle ECU. The codes in the HV ECU (and possibly in the Battery ECU) are the ones that will really tell you what's going on, but this code scanner does not seem to have read those. Toyota Techstream or some other scan tool that knows how to retrieve HV ECU and battery codes would get you the information you need.

C2318 means the voltage seen by the Transmission Control ECU (grandiose name for a box to move the transmission in and out of park), ideally in the 12 to 15 volt range or so, got seen at 9.3 or less at some point. Techstream would be able to show you a "freeze frame" of exactly what was happening then. That doesn't have to mean a problem with the 12 volt battery, as wiring or connector problems can also cause that, but if your car was sitting a long time, the 12 volt battery might be a likely suspect for that C2318. Worth giving it a good full charge and seeing what happens.