RFID Battery Mod Follow Up

It's been almost 6 months since I did the battery mod for the RFID receivers. All 3 transmitters are going strong. This is what I was looking for in terms of battery life, especially since the form factor with the battery pack isn't an issue. I did extend the antenna on the receiver some time ago. The range is pretty decent and I'm able to pick up the cars before they reach the driveway.