electrical system shutting off intermittantly after replacement hybrid battery added

Sorry, similar to last , but different....
Last week had hybrid battery installed, ever since I have an intermittant issue where the electrical shuts down completely, no power door locks, nothing on display at all, not even the "flashing car" displayed or open door, all preset radio stations gone, even gas gage incorrect (we just filled it two days ago and maybe has 80 miles, now flashing???)... All the information on the display is reset when it comes back on. The first five times it seemed to reset itself when we went to open hatch, not today. I used the key to unlock driverside door and manually unlocked the rear passanger door, as soon as my weight hit the area above the hybrid battery I heard it come back on. The first time i got out and tried to turn the car on and it shut down again, the second time it stayed on. BTW I tested the 12 v and it was @12.44, so not dead. I never had any issues like this until the work was done last week. Last week I wondered if the obd2 left in could have caused it, but realize now that since it hasn't been in the car since last Saturday, and driven daily since. I need help figuring out how to fix it. The place that put the battery in kept saying it was something wrong with the Key...

 

I checked the battery check at terminals, cables as tight as can be, ground also. I just went back to the oem cables in May, when I replaced the battery for the second time, (I'd bought a kit to change to regular battery terminals on the first change with optima battery kit from internet). They had been stored inside my toolbox. Should I test elsewhere? would that help me diagnose?

 

Thanks, will do, i just find it strange that battery that had been installed in May 2020 and had no issues until someone else worked on my car would all of a sudden start having issues after they worked on it. Did they remove the cables to add in the Hybrid battery and not reinstall them correctly? I will remove and reinstall completely today.
I am most suspicious because the way the work order happened, we left it off to diagnose and see if they could recondition the batteries. We then I waited all day and then finally called, someone called back a few minutes before closing and told me that they just happened to have a hybrid battery that someone else changed their mind about, and that I could buy it and pay an additional $200 to extend the warranty on it, it was too late to pick up the car as they were leaving for the weekend. Next, I got a long email after closing with a long discussion about batteries now they actually had a 3 year warranty and assurances that if I used them it would be a worry free transaction and if I didn't want to install them that we donate the car. His words, "Alas, if you decide not to repair the car we can arrange to donate it to our ASCCA state education fund to help up and coming mechanics learn the trade. I’m the local president so this is dear to my heart." So, we sent an email because we felt that he had not addressed other questions about the diagnosis and why if he jumped to us being able donate it, it felt wrong. Why would that even be brought up at this point? Also, the quote he sent added back in the diagnosis fee, (which he promised to remove) and a new fee for shipping that hadn’t been discussed. I reminded him that we asked to diagnose the car and advise us of any other issues that might need to be done and quotes before we would install the battery. When we talked on Monday he assured us that it had passed all diagnostics and we agreed to just put the battery in since it was there already. The next day we got a call and were told that the battery was installed and now they found a possible leak and should they proceed to diagnose it, it sounded like it was a hidden area and agreed. He then sent pictures and when I looked at them and realized where the leak was found, it was not hidden behind the batteries, but in the trunk, I declined knowing that a hydration pack had leaked there before. My point is that that should have been addressed before installation, not after! So, when we get the car back and start having a new issue, it just feels wrong.

 

Thanks so much, heading out to try after warms up a bit. I plan on cleaning terminals and starting fresh from the beginning. will update, at this point car won't even start at all so praying it works.

 

Ok, wish me luck, just finished, even took off positive connector to clean between it, it was wierd, because it appeared to have a black tar like substance there? The gas gauge finally reset after driving it a bit. there was bolt missing to the assembly that holds the positive to the battery tie down, any ideas on what mm and thread? can't find it anywhere and didn't want to pull battery completely out.

 

Thanks!!! I know I have some somewhere after replacing window on my Escape and buying them to replace broken ones, hopefully will fit!

 

Awesome, but I did find something, just to make sure! Thanks again for all the help!

 

Update, hoping I'm not jinxing myself, but knock on wood, the car has worked flawlessly since I worked on it last Friday. I appreciate all that helped me.