http://iscoresports.com/

Can I use two tablets to score a double header? I purchased I Score on my tablet and my grandson has the same tablet.
Can I get my I Score on his tablet to enable me to score the second game?
My battery is always low after the first game.

You can use data sharing to get the game FROM the second device after you score it (and the teams TO the second device before, if you want):
http://iscoreleagues.com/manual/#h.cveb04t3s2e7" onclick="window.open(this.href);return false;

A tablet should easily be able to score multiple games on a single charge. If you are going to the game with a full charge and only able to score a single game, you should check that other apps are not running in the background and using extra power. You can also turn down the brightness of your device if possible as the screen actually uses more power than anything else on the device, so turning down the brightness will help save power quite a bit.