Battery replaced with 6 hours warranty left

I am a Prius fan! We have a 2006 and a 2012. My wife came home the other night said a bunch of lights came up on the dash. I did a quick check (was thinking inverter, etc.) Went to autozone the next morning and had them read the code and it came out as battery failure. The car had 99600 miles on it. Drove home and decided I'd "reset the computer" by disconnecting the 12v battery (in my ignorance, I was thinking about my annual inspection appointment later that morning and didn't want any warning lights showing). After disconnecting the battery, checked the posts again, and was reminded about the 8/100K battery warranty. We'll, I was right at the cusp on both counts. I quickly reconnected the batttery, but the lights had been cleared. I went to my inspection appointment but while waiting they informed me that the computer had been "cleared" and I need to come back after it goes through its diagnostics (so much for thinking I'm smart). I immediately went to the Toyota dealer and told them about the lights, the code at Autozone, and my disconnecting the battery. I paid them $60 to scan the computer but they couldn't see the code, though they could tell the computer had been reset. They told me to drive it, not just putting miles on it but doing various combinations of acceleration, deceleration, etc. I spent the afternoon doing this. I was giving up and in the last mile coming home, the dash lit up like a Christmas tree again. Drove to the Toyota dealer. They scanned it and it came up with a couple of codes indicating a bad cell. He told me that I'm lucky, that this was the last day of the warranty, and if I came after they closed, in 6 hours, I would have been out of luck and subject to a $4000 replacement.

I felt like I had just won the lottery despite my foolish trickery.

Now I was planning on selling the 06, but since I have a new battery, seems it would be better to keep it. Also, this has somewhat shaken my love for the Prius and hybrids in general. If one has to worry about battery failure at 100K miles, it defeats a primary advantage of the Prius, the expense of fuel. The cost of the battery replacement negates any fuel savings. I'm also wondering about selling my 2012 before the battery warranty expires.

Something for me to think about for the future. Any thoughts?

 

I think I will keep it. The battery is newer than my 2012 model. Here in North Carolina its not too hot nor cold, and its a flat commute (so just one of those things, one of those timely things).

I actually like the ergonomics and Nav of my 2006 more than the 2012. If I decide to sell, it may be the 2012 that gets axed.