B check simply tells you if your battery has enough power in it to be pluging in and still getting a nice sound.

Nice guitar by the way, how does it sound?
Fender Strat-->Boss Me-50-->Marshall Mode Four
Fender P-->Ashdown Electric Blue
nice guitar i got mine yesterday identical new though, definatly the best accoustic ive played the neck is perfect for me and the setup and finids are awesome