I think it should be 6MhZ, like in Axe, and the user can change it to 15MhZ.

Hmm, okay. When I decided to make the regular commands run at max speed, I didn't disable that for ReCode which is why in the latest version it starts at 15MHz (if possible). So it looks like in the next version, default will be 6MHz

Just the ReCode part I plan to keep the rest at max speed

So would it be changing between 6mhz and 15mhz modes a lot if it was going between BatLib and ReCode and regular Basic?  Or would it always be set at 6mhz or 15mhz mode?

Ah.  In that case, I retract my vote, as the speed would be different on the 83+ anyway.
15mhz mode all the way!

The answer is yes and no
It will use the same power to perform the same actions, so in that sense, no. However, since it performs at 2.5 times the speed, it will drain at 2.5 times the speed. So, in situations where you need speed (graphics and data crunching), either mode will use the same amount of energy, but 15MHz mode will do it faster. However, if your calc is idling, waiting for user input, at 15MHz you are just draining your batteries.

So with that in mind, I will go back and modify some routines. The routines that wait for user input, like the getkey routines and Pause will execute at 6MHz and the rest will remain at the users current setting. This is especially a good idea for Pause because in 15MHz mode, Pause 250 would pause for 1 second instead of 2.5 like it would at 6MHz.

Hmm, BatLib has interrupts turned off, so that isn't a problem at the moment, but I didn't know about the sound... I guess I should change the sound commands to 6MHz mode, too! Thanks!