Mooney was ruled out of Wednesday night's 1-1 draw at Notts County with a thigh injury and Millwall loanee Batt has a hamstring problem.
Charlie MacDonald started on his own in attack at Meadow Lane but was joined in the second half by top scorer Kevin Lisbie, who scored Orient's equaliser from the penalty spot.
Lisbie has found the net on both his substitute appearances since recovering from the hamstring injury which sidelined him for two months, so boss Russell Slade will be tempted to play him from the start.
Defender Gary Sawyer and back-up goalkeeper Lee Butcher (both knee) are still out.
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- Kevin Lisbie