What I did, is I removed the former in the nose ( I worked it loose with a bit of heat and acetone ) then stuck a decent sized 3000mAh 4.8v battery pack in the nose ( $17.00 from BPHobbies ).

I had no problems with the balance after doing this.

BTW: on my first flight my nose gear collapsed because it did not lock down properly.

I placed a steel rectangular guard where the plane scraped the tarmac, so should this ever happen again, the fuselage will not be abused.