ETA following morning: I looked at this chart this morning in better detail. Thanks, this is actually a great easy reference so one doesn't have to do any figuring. Thanks for posting it. I usually just skim thru this stuff because by the time I sit down on the computer, which is TV for me, I am pretty much taxed and worn out for the day and the clear thought process is already half way out the door.
To answer the other question, I get my 3V batts from lighthound. They are the lifePO4's 500 mah (the little blue ones!) I have two sets, been using them big time, one set in the charger, one in the chuck, switch out every morning. I like my ultra fire charger from the same vendor.
I have used my batts for up to two days but can feel the drop off on day two. Now that I am long past the newbie stage, I quit carrying around the 'diaper bag' full of spare chuck/ batts/cartos/liquid. I just take my chuck and one bottle of juice.