Another battery question. AA and others

[Outlaws]

Could 3 AA batteries be used in circuits where only 4.5 volts is called for?  Would they last longer or shorter?

Also, what about for passive pedals that onyl have LEDs?  A single AA or AAA batter seems like it could be a nice idea for space conservations.  Would they last a long time?

What about watch sized batteries?


And finally....

All things being equal, I assume the larger battery lasts longer?

[petemoore]

I'm not real sure about lasting longer or shorter...I always figured that relates to size, and composition...[ besides...Carbon Vs Alkaline Vs Super Alka's...etc.]
 I've used lithium for low voltage circuits, and they seem to do just fine...all I know about it...never read current ratings 'n such's that..because I never happened on it....I suppose I could go look up battery spec sheets, and wonder what the current capability of a teeny lithuim is.
 I've also used AA and other type batteries to power Cct.s N/P...I just read the voltage.
 Carbon Comps reportedly do something for FF's..I wouldn't know.
 I use NiMh rechargables for a long Time, I think that's ok...lol.

[boogielicious]

A 9 volt battery is just 6 AAAs in a bundle.  The AA should last fine.

Scott