Wierd electrical problem?

I have two ceiling fans with lights in my living area. They are both operated by remote. Either remote can operate either fan.
One remote is placed on one wall, the other on a different wall - for ease of access.
If I place either remote on the shorter, internal wall, the batteries will die overnight. Whereas the batteries in the other remote will last weeks.
Could this be caused by some kind of electromagnetic field or similar?
One remote is placed on one wall, the other on a different wall - for ease of access.
If I place either remote on the shorter, internal wall, the batteries will die overnight. Whereas the batteries in the other remote will last weeks.
Could this be caused by some kind of electromagnetic field or similar?