Priusv Fob and intermittent opening door

Priusv fob does not always open door. I click it, stand next to car and sometimes it works. Seems like after I drive and come back, it works. I have tried both fobs, new batteries, same issue. Any ideas? Thanks.

 

Battery is original, 2104...11 yrs. I was thinking this also. Thanks.

 

Got the 12 volt battery replaced this am, so far seems to have solved issue. Surpsiningly, short of going to the Stealrship, nobody wanted to touch replacing the battery even though I told them it was not the hybrid cell. I did find a couple who quoted 400$ plus, finally just used AAA.

 

Well, I was wrong. Problem still with tthe door. Again, it is itermittent. Both fobs have new batteries, and neither mechanical key will open door. Question, is that key supposed to turn or just acitvate the unlock when inserted. They key does not turn. Really need some help, starting to panic. Thanks.

 

When the fob works, it will open the driver and or all doors. Once inside, door switch works. New 12 volt battery done on Thursday, both fobs have fresh batteries as well. Did WD40 on the lock overnight but did nothing, key. still does not turn. The keys are the ones that came with fobs.

 

A follow up to this issue... I tested both fob batteries and checked that they were clean inside as well. Each cell showed 2.5v. I used 2 different meters as well for the cells. My thinking was that 2.5 should still be working; maybe that is why it was intermittent opening?? I bougth new cell, tested at 3 v. No issues opening the door. I was also able to use the mechanical key without any issues, which brings me to my next question. My thinking, maybe wrong, that the mechanical key would open the door when the fob failed which it did not do. I would think that the cell should be able to work even at 2v, any ideas?