ScoreTronics Inc., manufacturers of portable remote controlled scoreboards.
The batteries used in the PBA-4  and PBA-4L are standard AA alkaline batteries.  The batteries (which are included) will operate the scoreboard for approximately 500 hours, which is 200 2-1/2 hour games.  This is several seasons for most organizations.  A replacement set of AA batteries for the next several seasons costs about $6.  

Contrast this with any other system that uses rechargeable batteries that must be plugged in and charged before every use.  Invariably, someone will forget to plug the unit in and it will die in the middle of a game.

The PBA-4's batteries will require NO attention for the entire season and more, for most leagues.  You just take it to the game and use it--no fooling around with "plugging it in".  The unique design of the displays and electronics in the PBA-4(L)* makes the outstanding battery life possible.  

*patent pending