Originally Posted by sparklehorse
I agree, Alkaline = Bad Idea. The first thing I did when the Pro-2006 arrived was replace the 9v with an Energizer Lithium 9 volt, which have a very long shelf life. I did not use a Lithium-ion, which I believe can self-discharge faster. So I'm not concerned with leakage at all, my only worry is how quickly will the radio drain that Lithium 9v once it's unplugged from AC power.
My weather station on lithium batteries has run for 10 years and voltage on batteries is still good, used them because they are least affected by cold. Camera manufacturers used to recommend Lithium.
I believe carbon zinc leak less but have shorter life.