slow current leak-- cannot find the source

All--
I have a 2012 Prius that runs fine-- can go on a 300 mile journey, but if it sits unused for 10 days, the lead acid battery is dead and the car will not start. Recharge the battery and it works fine. The battery has been replaced several times-- that is not the problem, nor is the charging system the problem. Toyota did the usual check for a current leak and could find nothing. The lithium battery seems fine-- the display shows it charging and the car intermittently runs on the Li battery as it always did.

If I remove all the fuses from the passenger compartment, the leak goes away. The battery remains charged and the car starts after two weeks or more.

I know that the IGN and ECU-ACC circuits kill the battery, because if I add them back to the passenger fuse box, the battery dies in a week.

Each test takes about 2 weeks to run, to confirm that the battery is not going to die.

Are there any Prius electrical system experts out there with ideas? Any better way to identify the source of the leak?

 

Thank you for those quick responses. Yes, I'm referring to the 12V AGM lead-acid battery. The rechargeable battery is NiMH in a 2012 Prius (my error). The Toyota dealer did the leakage test and it was too small to detect using the standard test at the battery. Or perhaps the leak is intermittent. In any case, that is why the charged battery lasts 10 days before dying. Before giving up I will probably run a standard leakage test myself-- maybe the Toyota dealer was not careful enough.

 

@Mendel Leisk-- I am new to this forum and don't see how to message individuals, so I hope you see this. I searched @ChapmanF for postings about current leaks and did not find any specifics on methods that you referred to. Do you have a date or ID on that post?