S4 Intelligent Key Battery Changing / Charging

bigyin

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Morning all, only just picked up my S4 last week and yesterday the dash flagged up a warning telling me to change the battery in my key fob. I've been using the key without 'plugging' it into the car i.e. only time the key comes out my pocket is to lock the car. Does 'plugging' the key in charge the battery? Or is it a new battery required?