Thank you everyone for your advice. Much appreciated! So if I do 2qt/1lb for the mash, how much water should I use for the batch sparge?
Here is the info from my last batch:
OG - 1.055
With a decent efficiency, you should hit 1.055 with 9-10# of grain.
For 10#, you would mash in with 5 gallons, lose 1.2 gallons to absorption, and get 3.8 gallons first runnings. You could then batch sparge with 2.7 gallons, if your pre-boil kettle volume target was 6.5 gallons.