K.C. Dia Posted January 24, 2011 Share Posted January 24, 2011 My 2011 Lexus 350ES is now 13 months old. How long can I expect the battery in the key to last. I use the vehicle every day. Are there any signs that the battery is getting weak and does the dealer have to replace it. There does not seem to be any way to take the key apart. Quote Link to comment Share on other sites More sharing options...
Billglea Posted January 24, 2011 Share Posted January 24, 2011 My manual says the battery should last 2 years. I replace mine every year just to be on the safe side. The remote does open, it is split along its length. Use a knife to pry it open. Quote Link to comment Share on other sites More sharing options...
SW03ES Posted January 24, 2011 Share Posted January 24, 2011 In our experience with the similar key in the Prius, I'd say 2 years life is pretty average. Symptoms include it being picky about unlocking when you put your hand on the door handle, failing to recognize the key when you go to start, etc. Quote Link to comment Share on other sites More sharing options...
peteanello Posted January 25, 2011 Share Posted January 25, 2011 There is a youtube video showing how to change the battery: http://www.youtube.com/watch?v=Za7pCdUde3U It's very simple and I change both key fob batteries every year. Quote Link to comment Share on other sites More sharing options...
pj8708 Posted January 25, 2011 Share Posted January 25, 2011 There is a youtube video showing how to change the battery: http://www.youtube.com/watch?v=Za7pCdUde3U It's very simple and I change both key fob batteries every year. Step by step instructions are in the owners manual. Paul Quote Link to comment Share on other sites More sharing options...
GrnIdKjun Posted August 26, 2014 Share Posted August 26, 2014 I just got my "new to me" Lexus this month. One key fob is already registering that it needs a new battery. Before I pry this fob open (dealer is a 2 hour drive away).. is there a chance I might break it when I try to open it? What should I be careful of? Anything? Thank you. Oh.. and when it starts registering on the dash that it has a low battery.. about how long does one typically last before it's done completely? I know all batteries are different.. just looking for an approximate. Quote Link to comment Share on other sites More sharing options...
LexBob2 Posted August 26, 2014 Share Posted August 26, 2014 You shouldn't have any problem replacing the battery. Its pretty straight forward. Just follow the instructions in the owners manual and its pretty easy. Quote Link to comment Share on other sites More sharing options...
pj8708 Posted August 27, 2014 Share Posted August 27, 2014 To my knowledge there is no way to measure the "working" time left on those batteries. Since it is virtualy bullet proof to open and change the battery, and the battery is so cheap, just do it once a year to make your self feel secure. The batteries are available at Interstate Batteries, Clock stores, and any place that sells small batteries such as those mentioned in your Owners Manual. You do not have to buy a battery from your dealer. They charge way to much. Quote Link to comment Share on other sites More sharing options...
GrnIdKjun Posted August 31, 2014 Share Posted August 31, 2014 Thanks guys.. it was easy to pop open.. the hardest part was getting those suckers to snap back together. All done though! Quote Link to comment Share on other sites More sharing options...
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