Codes P0335 and P0340?

So, the car was fine when I drove it last and has run fine without any problems at all I have an OBD that is also GPS it stays plugged in it has only given one code in the past that was something about bank 1 dealing with the catalyst or something I'm guessing is the cat converter. I left last night drove to store about a mile away put gas in drove home the car sat for about twenty minutes my wife takes it to the store it shuts off at the end of the block. The dash lights and hazards only door lights dim and blinking radio inoperable. We hook it up to jump it starts up after about one minute of charging we have time to close the hood and I put in drive started to pull off then brake for oncoming after hitting brake dash lights go out car starts to stall doesn't cut right off but loses all power I stop we try to jump again it takes around two minutes and some finessing with the cables to get started after starting I immediately try for home the car stays started but has absolutely no power at all will only drive maybe 2 miles an hour pressing accelerator does nothing letting off the accelerator and the car stutters and dash goes off and stalls out. Towed it home read my codes this morning from my OBD tool and it is showing two new codes but not the old cat code the new codes are crankshaft position sensor A, and camshaft position sensor circuit malfunction or P0335 and P0340 respectively. I am considering the alternator as well but as I've had no starting stalling or crank issues at all till right that moment it just doesn't seem to fit the only thing that makes sense with that is my obd keeps record of batt. Voltage over time mine has been running a steady 12.3-12.5 until last night where it shows a steep and instant drop to 11 flat the battery is from 2018 so it's an old battery I don't know if the cell went bad in that moment or what happened but I know its old I don't have the money for a replacement battery right now though I know I should probably start by replacing that because low voltage could interfere with the sensor signals, right? Would charging the battery be a good first step or testing I mean to be sure the battery is still in good order or should I just replace the cam and crank sensors and try to start again I wasn't sure if the cam and crank sensors could cause the symptom of the voltage problem as far as the lights on dash going out or if it maybe drained battery somehow? I'm clueless Orielly closes in two hours and I have to work and get three kids and a fiancée to school and home as well need urgently to figure this out or at least my next moves. I thank you I advance.