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Discussion Starter · #1 ·
Few days ago I got a warning from the car that the battery of the key was almost empty and should have been replaced as soon as possible.

(I admit that at first glance, reading that there was a problem with a "battery" scared the hell out of me... Too many batteries in an EV!)

Anyway, I didn't find any info on how to replace the key battery in the instruction manual, and it was not that obvious how to do it by simply playing with the key.

So I researched online and eventually found this video:


I thought it could be useful to post it here and save you guys from getting lost watching endlessly totally unrelated YT videos.
 

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Good reminder. Mazda state in the user guide that batteries should be replaced yearly as you may OR may not get a dash warning depending on the rate of drain. I replaced mine last week (less than 6 months ownership) as in the colder and wetter weather keyless was inconsistent (I do sometimes find in sleety or snowy weather it won't recognise my hand behind the handle) It tested at 2.9, new should be 3.3 ish so not bad but hey ho I was in there so may as well change it! I do wonder if high usage of entry and exit plus possibly key "chatter' with the car can cause premature drain. No doubt we will find out in due course on this very forum.

Alan
 

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See below from the user manual

If the key does not operate when
pressing a button or the operational
range becomes too small, the battery
may be weak. To install a new
battery, refer to Key Battery
Replacement (page 6-24).
x Battery life is about 1 year. Replace
the battery with a new one if the
messages are displayed in the
instrument cluster. Replacing the
battery about once a year is
recommended because the KEY
warning indication may not display
depending on the rate of battery
depletion.

¾The key (transmitter) may consume
battery power excessively if it
receives high-intensity radio waves.
Do not place the key (transmitter)
near electronic devices such as
televisions or personal computers.

Alan
 
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