Influences and false P0A80 positives

Hi all.
Some of you may have helped me troubleshoot my situation, for those who don't know I recently had a "replace hybrid battery" code P0A80 on my lovely 2010 Prius with 150000Km. I have looked for many alternative replacements and I'm hoping to buy a new battery from our friendly neighbor 2k1Toaster who sells brand new cells, just gathering some founds.
Then came a big doubt. Can this code be thrown by mistake or as a false positive, if it is influenced by some other condition? I have read that a dead 12V battery could start this code and by my Toyota dealer, even a clogged hybrid battery fan can cause this too, as it has happened to me over 2 months ago.
The condition I'm talking right now is a recall maintanance from Toyota that I lately discovered for my serial number. They are actually 2 concerning a malfunction on the ECU not allowing a correct activation of a security mode when the inverter malfunctions or something like that. Tomorrow I'm expecting a call from Toyota explaining the specifics and I'll share the detailed with you.
Could a situation like this be causing my dead battery code?
I haven't tested the 12V battery yet, the fan of the hybrid battery has been cleaned 2 months ago and I have tried a quick test on my hybrid system that I have found on youtube. I get the battery half charged and then I push the car from 0 to 60mph to see if it mantain the charge or discharges very quickly and it does hold the charge correctly discharging only 1 line.

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I am not using the car at the moment. The hybrid system has been disabled twice till now on it's own and the codes have been reseted twice by disconnecting the battery as you say just to move the car from the shop to home. The reason why I'm not moving it, it's because they told me from the Toyota dealer that depending on the battery condition, sooner or later the hybrid system will shut off completely the system to avoid further damage to the battery, so, sooner or later it may leave me stranded on the road. It's in my garage up untill I get the new cells and this recall issue taken care of for sure.

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I get it. I'll check out how much is for the ODB2, that's the one I've seen use the most. The cheapest and most affordable way I found to change the battery is by using 2k1Toaster's kit with new cells, actually new cells, not used ones I think it's worth it if I'm importing those from the US.

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I checked the ODB2, it's dirt cheap I'll buy it as soon as possible, I thought it was something rare to find or for mechanics only.
Going back to Luckykat32 I agree, my story is the same:

1. 2 months ago the "CHECK HYBRID SYSTEM" message showed up on the screen and the electric motor deactivated on it's own, only the ICE was running.
2. At the Toyota they said that they got a Change Battery Error code, they didn't tell me what code in particular, at that moment in time I wasn't as much informed as of right now, but they told me that since they found the battery filter clogged it could be the cause of that message. Cleaned it and reseted the codes. On a side note they returned the car to me with the CHECK ENGINE yellow light still on saying there's still some problem that they didn't even look for and that I had to go back to have it checked again. You can immagine I was very frustrated for the paid half assed maintenance they did but they told me I would't be charged the next time. I had no choice I needed the car, it's the only one I have, I'd be back.
3. After a month of running smoothly "CHECK HYBRID SYSTEM" message is back with all the same symptoms.
4. At Toyota this time I forced them to give me the codes that they get in the diagnostic since they weren't willing at the beginning. P0A80 it is.
5. Codes have been reseted and the car is still in the garage since last month.

Going back to davecook89t now, I get what you say and it makes perfect sense, a still battery could discharge and loose its balance even worse, that's why every time I have to go to the local grocery shop in my neighborhood I take the Prius for a short drive so it doesn't stay still all the time but I don't feel safe driving around the city everyday. I mean I could always call my insurance to pick me up if everything goes wrong but I'll wait for the ODB2 first, I'd feel safer to know the HV battery real time health before risking to drive even further away.
Man this last month has been tough, I've been driving with a 2.5L engine VW I could borrow that is consuming double what my Prius does.

 

Sorry I don't get it when you talk about "freeze frame data". Should I find this with an ODB o similar accessory?
Correct me if I'm wrong. What I understood is that the last time Toyota had my car checked out all the data from that error code should remain in the car's computer?

 

Hi. I've been looking for similar device, I didn't know they were that common at all. I thought they were special mechanic tools.
I looked for the one you are recommending and yea it's kind of expensive. I found some a lot cheaper but at the end turns out I found this one at my local Autozone, OBD Reader ODB-1001 from Pilot Automotive (sorry cannot post links yet because of forum regulations).
It's priced halfway and I get local warranty.
Before buying, how can I know if this will be compatible with my car. At first I thought OBD2 was a brand but it is really a protocol right? On Board Diagnostics? Looking it up it says it's really on every car, from 1996 to today, so can I rest assured it will work with my 2010 Prius. From then on I can use all the apps I want right? or do I have to use the one that comes with it.
Thanks.