What voltage is output by your new batteries? Thats the only thing you need worry about when it comes to frying the board via batteries!
I used to run 1000MAh 1.2 Volt AAA's and they kicked a$$ - never had any problems with them and if I was being honest I would say I preferred them over liths!
__________________
Duct Tape is like the force:- it has a light side and a dark side and it binds the universe together.....
|