Dead Yaris. No Power

[SirDigby]

hello. i hope it's just a battery issue.
i started vehicle without any issue. let engine warm for 10 minutes. backing out of parking spot, had a hesitation and "p/s pressure" loss. had a hesitation and stall reset dash/power port/radio when pulling forward. had a hesitation and p/s loss when foot off the accelerator pedal. pulled into fueling station and turned off vehicle. when returning from store, (1 minute) no power, no start. oil sensor and door indicator only. no clicking, or anything. DLC is functional. "no communication" is displayed. acts like ECU is fried. battery terminals look okay, but corrosion is present. battery has never been replaced by me, is a cheap die hard silver battery. many extra ground straps have been added to system.
i will replace the battery and clean terminals when the sun comes up. i hope this is the issue. seems strange...
also, door locks are not functioning...