I have almost completed the longest, most wasteful type checkout in my flying career (thanks, Brampton Flying Club

). Now I have to write a short written exam.
The POH (for a/c Nos. 18-7409140 and higher) performance figures state that Vx is 45 MPH. The "takeoff speed" is identified as 30-35 MPH. Are those figures correct? They seem awfully low, especially as the stall speed is given as 43 MPH with flaps, and 47 without.
While I've got your attention, can anyone tell me about the battery, which the POH variously describes as "12 volt, 23-ampere" (page 12) and "12 volt, 33-ampere" (page 33).
Sorry to take up your time with these enquiries ... I know that the proper person to ask is my "instructor", but he doesn't have any answers.
Thanks,
MLS-12D