Hello Willow,
As asked her is the information on blade boiling.
http://www.youtube.com/watch?v=RmNv8OlG6GQ
The reason for this task is to improve on the "trueness" of the blade and how it cuts into the air. This will help you hold a hover and stablize you heli. While at YouTube look up CX2 Blade Balancing too.
Re your battery question, I have been in the hobby for a year and know of nothing one can do to pump up a battery beyond its designed power band of 800 850 900 etc. by using any special charger. I will share that a better than stock charger will in fact better BALANCE the batteries two cells equally which will extend your flights. Go to Horizon Hobby or Horizon Zone and look at the EFLITE C505 which is one of several charges I have, she is a keeper.
NOTE here is the blade balance site for you
http://www.youtube.com/watch?v=15h9G37VDEU
Goood luck JPee