If it is like the D3 key it is sealed so it is waterproof to 10m (from memory). You can change it but you have to break open the key to gain access and then it is no longer waterproof.
There are new key fobs available on eBay but they aren't waterproof either.
The car charges the battery in the key inductively so it is a good idea to swap keys occasionally. My keys are 7 years old, the spare that was not charged frequently has gone flat and won't recharge, the key I use daily still works fine.
				
			 
			
		 
			
				
			
			
				Fuji white RRS L494 AB Gone
2023 Ford Ranga
			
			
		 
	
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