Batteries for your altimeters
I use li-ion or litium batteries because they are reliables, they last longer, provide much more current for a lighter weight. When looking for a battery make sure that your altimeter will work with it.
Most of my altimeters will work fine with 2 cells batteries or 9V shape batteries (not for the SMT version).
You can buy those from hobbyking.
Note that the latest SMT version can work with one cell batteries. If you are unsure which battery you can use with your altimeter I suggest that you go to the altimeter sumarry page. If you have any doubt do not hesitate to contact me.