Two problems related to battery have been reported for the 2001 Toyota Prius. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2001 Toyota Prius based on all problems reported for the 2001 Prius.
Vehicle stalled/died, and lost power while driving 5 mph. Throttle body module failed. There was a NHTSA recall but this involved a chemical in the pruis car battery. L. Yes. Car has broke down several times since. The stalling is still a problem.
While coming down a steep mountain coasting, the vehicle electrical system showed a failure and I was able to resume after a tech told me to shut it down and restart. Additionally , when in stalled slow traffic the battery seemed to drain excessively on only one occasion. Neither of these events has recurred.