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The access key is always communicating with the vehicle and is continuously using the battery. The Australian Owners Manual states for the keyless access with push button start system. I have a 2019 corolla hatch.
Its best to replace the battery in all remotes at the same time as they are often sold in pairs.
The key fob does not work consistently. They suck down to 28 volt or less with 100 ohm. In most cars a key fob battery is not rechargeable and must be replaced once it loses its charge. Around three to four years.
