I feel like I'm replacing the key fob battery pretty frequently, at least every year. How long are they supposed to last? I get a "low battery" alert on the dash, and when I check the coin battery voltage with a tester, I still get 2.8 -2.9 volts. The CR2032 battery is a 3V battery, so that doesn't exactly seem like "low" to me. Does anyone know the details on what the voltage limit is supposed to be?

 

Actually just had light come up too. Old batt was 2.89v, new batt 3.289. So seemingly 2.9v is the threshold for low batt warning.

 

Good to know, thanks for the reply. It kind of makes sense, because I've noticed that the remote has pretty impressive range. Even the remote start works through two floors in my office building underground parking deck, so that's got to be quite a strong signal.

 

I know this thread is a little stale, but I have some questions, because I want to see if your issue is the same is mine.

- is this a new problem, or has this been the case since Day 1?

- is the behavior only in one fob? Or does this affect both fobs?

My fob batteries (2010 TL) have always lasted 3-4 years, but lately, both fobs give low battery behavior within a few weeks. This started spontaneously after more than 10 years, and to both fobs at the same time. I created a post for it, but no good suggestions so far.

- Did you ever find a resolution other than the batteries in your fob(s) really are too low?

 

The coin batteries for the FOBs come in Lithium which should last longer.
I read somewhere if the FOB is always close to the vehicle, there is draw from the remote constantly connecting and reconnecting with the vehicle like proximity unlocking. Not sure if this is true or not but makes sense. If this is the case, try moving the FOB from where you usually keep them further away to see if it helps. Otherwise, like myself put the FOB in a Faraday box for anti-theft and signal blocking.

 

I had to tell my spouse not to leave her purse with the fob inside in the garage overnight and move where we normally keep our fobs in the house further away (far side of kitchen now instead of next to garage door). Keeping the fobs too close to our 19 MDX and 18 RLX ran down the fob batteries faster in around 2 years. Now seeing normal +3 years per fob moving them away at night and weekends. Wasn't an issue with our previous Acura's with just lock/unlock door/hatch button only fob features.