I saw one post that mentioned that Lexus says they should last 1.5 to two years. I just replaced mine after 1.5 years. Just wondering if that was typical with everybody else.

 

That's about what I got on mine. Closer to two years. I ordered a ten-pack of the batteries on Amazon for $8.92

 

That's what I always do too! A single battery is like $5 at the store, so for the price of two you have batteries for the next decade.

 

Yep! I put them in a snack bag labeled with a sharpie so I remember what they're for.

I just bought a 5-pack of ECR1616s for my wife's Acura - another weird battery I've never seen used in anything else. Most things I need coin batteries for use the standard CR2032, but I guess that's a big big for key fobs.

 

Really depends. I find the battery in my credit card key lasts maybe 8-9 months

 

Mine have been dying after 6 months.

 

Mine has lasted the whole 2 weeks I've owned the car so far...

 

I would agree the credit card battery lasts much shorter than the regular fob battery. I think I got around 6 months on the credit card battery.

 

Be aware if you leave your key fob in the parked & unlocked car for extended periods
of time that the fob battery will draw down quite quickly. Never was a problem to leave
a conventional key and door/trunk lock fob in the car but the Keyless entry system will
be "talking" to the car all night...

Anecdotal stories regarding some mail order bulk battery sources is that they are not
necessarily first line brand name units and may not perform as expected. Even if a
known construction and purchased fresh is left uninstalled it will begin to deteriorate.
By the time you get to the 5th battery in the pack it has been what? 5 -10 years old?

 

I don't believe that the wireless remote key talks to the car when it is left in an unlocked unattended car.

The lithium coin batteries have an expected shelf life that is greater than 10 years when stored at moderate temperatures and humidities.

 

My LS460 remote battery was dying too quickly. There were couple of reasons at different times.

1. When battery was installed, one of the buttons was somehow in a pressed position that was draining the battery. Once it was reinstalled properly, thing got better.

2. I read and have seen on video about proximity of the battery. It tries to communicate to the car and that drains the battery. Solution was to put it in a foil. I added foil insert where I was storing the remote and the problem went away. It seems to be a safety measure too. Search google for "wrap car remote key in aluminium foil"

 

I have the LS for 4 years now and replaced batteries on the key fobs once so far. I forgot what's the battery size it is. Anyone care to share?

 

CR1632 lithium battery.

I import them from across the world. Costs less than a buck for set of 5.

 

Here is a quick video on how to change the battery