ECU shorted and VVEL replacement from using battery tender?

Vg247

Dear all, I'm a new owner of a 2010 370z Roadster with 20k miles in pristine condition with no modifications, bought from my brother who pampered it and had no issues ever.

As this is my weekend car, I used a CTEK battery tender to keep the battery maintained while not driven.

Two weeks later I came to start it up for the first time to drive and the engine idle was very low, would not rev to a higher limit, and the start up was very weak exhaust note.

Took it to my local dealer and they said the ECU was shorted and it needs replacement, reprogramming. Additionally today they said the VVEL needs to be replaced as well.

Does any of this make sense and anyone with similar issues? My 991 Porsche is plugged in year round when I'm overseas for work and she starts with no issues.

Mainly I'm boggled how a CTEK trickle charger/battery maintainer can short the ECU on the 370Z....dealer was not helpful and did provide an explanation as to possible root causes.

At this point I just want the car running again so I'm at their mercy.

Thank you in advance for any information you might be able to enlighten a new 370 owner with on this issue.

Regard,
Vg