I have a trigger that is calling an @future to avoid hitting both SOQL limits and script limits.  It workis fine when you go into the account and make the change manually but not when run for a batch. 

Here is the trigger:

trigger ZipAcctChangeShare on Account (before update)  {

 	set<id> idso = new set<id>();
 	set<string> zipso = new set<string>();
	For(Account acc :trigger.old)
	{
		//Only send id's for those accounts with zip changes
		//system.debug('the old id trigger.oldMap.get(Acc.Id) is  ' + trigger.oldMap.get(Acc.Id));
		//system.debug('the new id trigger.newMap.get(Acc.Id) is ' + trigger.newMap.get(Acc.Id) + ' the acc.dd is ' + acc.id);
		//If (trigger.newMap.get(Acc.Id).BillingPostalCode != Acc.BillingPostalCode)
		If (trigger.newMap.get(Acc.Id).BillingPostalCode != Acc.BillingPostalCode)
		{ 
			idso.add(Acc.Id);
			zipso.add(Acc.BillingPostalCode);
		}
	}

	//system.debug('the size of idso is ' + idso.size());
	if(idso.size() > 0 && zipso.Size() > 0)
    	ProcessZipChangeOnAcct.ChangeShare(idso,zipso);
}

Here is the @future

public class ProcessZipChangeOnAcct {
@Future
    public static void ChangeShare(Set<Id> idso, Set<String> zipso) {
 	
 		//Build list of old zip code needed 
	 	list<Account> zipsrecs = [SELECT id, BillingPostalCode from Account WHERE id in :idso]; 
		
		//Get All territory zip records for zip codes from above
		List<Territory_Zip_Code__c> tc = new List<Territory_Zip_Code__c>();
		For(List< Territory_Zip_Code__c> t: [SELECT id, GroupId__c, name FROM Territory_Zip_Code__c WHERE Name in :zipso])
	                Tc.addall(t);
	              
		//List to hold account share to be deleted
		List<AccountShare> tbdACCShList = New List<AccountShare>();
	
		//get list of AccountShares that have an ID matching the Account ID’s in the set
		List<AccountShare> lAS = [Select id, AccountID, UserOrGroupID From AccountShare WHERE AccountID in : idso];
		
		For(Account acc :zipsrecs)
		{
           for (Territory_Zip_Code__c tzc: tc)
           { 
 	       	for (AccountShare Ashare :lAS) 
	        {	
			    if(Ashare.accountid == Acc.id && AShare.UserOrGroupId == tzc.GroupID__c) 
			 	 	tbdACCShList.add(Ashare);

			}   //for (AccountShare Ashare :lAS)
           }    //For Terr_Zip 
	    }  //For Account 
	      
	   	//If we have records to be deleted, delete the records    
	   	//system.debug('the size of the delete list is ' + tbdACCShList.size());       	 
		If(tbdACCShList.size() > 0)
		{
			try
			{
				Delete tbdACCShList;
			}
			catch (Exception e) {
			}
		}
    }
}

 Thank you for any assitance