Prius 05 Hybrid battery

Hello Everyone. Happy New Year!

I have a Prius 2005. In the past, I replaced bad cell 2 times, no problem except last time was around Nov 1st, about 2 months ago. This time I bought 2 used cells removed from 2012 Prius . The Car ran fine but next day, the warning came up and nothing is working, wont start up. I ran diagnostic, it said the negative side hybrid relay stucks closed. I opened up the battery, and I checked the function of all relays. I found one of the temperature sensor wire is broke right at the edge of the sensor. I think I broke it when I accidently dropped 1 cell to the floor from 3 feet above the ground. I resoldered the wire (but i did not check the function of the sensor). However, fixing the sensor doesn't help. I was thinking the car worked fine before until one cell went down to 6.2 v , other cell to 7 v. so it must be the batteries I installed are incompatible, therefore I ordered the 2009 used battery. After Installed 09 batteries the car worked fine until yesterday (almost 2 months), the triangle came up again. I diagnosed and the code said bad hybrid battery, needs to be replaced. However, the car still running normal except the warning light. I opened up and replaced the relay for the negative side of the hybrid which diagnosed bad 2 month ago. I Checked voltage on all cells, they are all over 7.5 v. My 12 volts battery also replaced from dealer few months ago.
I cleared the code and test ran. I noticed the battery indicator full charged but suddently went down quick to 3, 2 bar then the warning light came up, then it charges again, but i noticed intermittently I went down then warning pops up. Does anyone have that problem before? The car still run with the warning on. I am afraid to run long test and just around the block to find the problem.

Please help!

 

i am using Cen-Tech

 

Here is the update. Yesterday, i drove around the block until the car died. I touched the battery pack to check the temperature OK, Fan was running OK. I opened up the battery and check all cells. I found all the cells are 8 volts or more, except 1 cell is 6.5Volt. I replaced the bad cell but did not have a chance to start the car until this morning. The Car started up with warning light, I diagnosed, Error Temperature sensor..see picture please help.

 

Here is the Final update, hope to help someone who has the similar problem in the future... I looked up the error code "temperature sensor circuit A is high" meant "High Resistance". When the circuit is open the resistance is high. I opened the right side end bracket, using the small mirror and small tweeter to pull out the sensor without removing the battery. the wire was broken but still attached to the sensor by the shrink tube. i resolder the wire. The problem is Fixed. No more warning light. I cleared the code. Test drive all day yesterday, no problem. Thank you.

 

Thank you sir. My case is opened, high resistance Thanks again.