Although simple in appearance, your dog's receiver (collar) is actually a complex feat of technology- essentially it is a tiny computer. Like a computer, a clean and reliable is critical to it's performance. Not all batteries are created equal!
Be sure to protect both your pet and your investment by using only authorized and approved replacement batteries in your receivers. Damage has been known to occur as a result of generic batteries sold as replacements. MANUFACTURER WARRANTIES DO NOT COVER DAMAGE CAUSED BY USING THE WRONG BATTERIES.
More important is the potential danger you pet would be in should the receiver fail due to premature failure of the battery.