Not sure about your Lipo battery whilst already at the game site? Shreq Airsoft shows why a battery checker should be handy and that you can bring with you... "Awesome way to check those LiPo batteries in your airsoft gun while on the field. I review a really inexpensive and cheap Lipo Battery checker in the Airsoft Tech Review.

This little button on the back of the battery is to set a voltage alarm when the battery gets down to 2.7 to 3.8V. And yes, you can permanently hook this up to your lipo battery in your gun, if you have room, for continuous voltage monitoring."