New Key FOB or new battery?

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My LX key with a new battery has a range of 20ft, shortly after installing said battery, range quickly deteriorates to 5 feet or less. That lousy range is the only reason I ponder an aftermarket alarm system for the thing.
 
This whole situation is seriously strange.

Its sounds kinda dumb to complain about a thing like this, having to stand "close to a car" (that presumably you're getting into anyway) to remotely unlock the door you're about to grab and open, but after dropping $70K on a vehicle, I'd be pissed off too.

There must be a different manufaturer or an actual part that isn't the same in these situations. Maybe the receiver is not able to pick up the signal b/c of antenna blockage, aftermarket mod? I don't know, but there has to be something we're not addressing.

This should be simple. You can see your vehicle, you push the button and it unlocks...
 
Just replaced the battery with a CR 1616 3v Energizer.

Works from 25+ feet again!
 
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