ORIGINAL: ChuckW
Are you having a problem with your current batteries? If not then there's no real need to switch.
The guy saying he can fly for a month without recharging would be foolish to not fully charge his batteries before a day of flying no matter what battery chemistry he is using.
Each battery type does bring some sort of advantage to the table as well as some sort of disadvantage. For the typical sport type planes that the vast majority of us fly NiCads and NimH are low cost, easy to work with and provide great reliability.
The only other batteries out there that really interest me are A-123's. I may give them a shot on the next larger plane I put together.
No,I'm not having a problem with my current batteries.I would be willing to spend the amount I mentioned if I could go without charging for multiple days, even weeks.
Why charge a battery when it doesn't need it just because it's a new day of flying? The guy I mentioned is definetely not a fool. He's one of the most careful fliers at our field. He checks his batteries before every flight. And does a radio check from distances you wouldn't believe. He does tend to go for the top of the line in everything he does. Of course he has larger planes too. To each his own. If he suggested the lithium ions, I respect his opinion.