moveObjectsToNewOrg b = new moveObjectsToNewOrg();
Database.executeBatch(b, 50);

Account acct1 = new Account(Name='Dummy 1');
Account acct2 = new Account(Name='Dummy 2');
List<Account> accList = new List<Account>{acct1, acct2};
submitDataToTargetOrg.submitDataUsingRest(accList);

global class moveObjectsToNewOrg implements Database.Stateful, Database.Batchable<sObject>, Database.AllowsCallouts{

    public Database.QueryLocator start(Database.BatchableContext context){
        if (LOG_THIS_CLASS) System.debug('starting batch.. : ' + context);
        return Database.getQueryLocator('SELECT Id, Name FROM Account WHERE Name LIKE 'Dummy%'');
    }

    public void execute(Database.BatchableContext context, List<SObject> scope){
        submitDataToTargetOrg.submitDataUsingRest((List<Account>)scope);
    }

    public Void finish(Database.BatchableContext context){}
    }

public static HttpRequest submitDataUsingRest(List<SObject> recordsToTransfer) {
    Schema.SObjectType sObjectType = recordsToTransfer.getSObjectType();
        HttpRequest req;
        if (sObjectType != null){
            String listType = 'List<' + sObjectType + '>';
            List<SObject> castRecords = (List<SObject>)Type.forName(listType).newInstance();
            castRecords.addAll(recordsToTransfer);
            String reqbody = 'grant_type=password&client_id='+clientId+'&client_secret='+clientSecret+'&username='+userName+'&password='+password;

            Http http = new Http();
            req = new HttpRequest();
            req.setBody(reqbody);
            req.setMethod('POST');
            req.setEndpoint('https://eu6.salesforce.com/services/oauth2/token');

            HttpResponse res = http.send(req);
            OAuth2 objAuthenticationInfo = (OAuth2)JSON.deserialize(res.getbody(), OAuth2.class);

            if(objAuthenticationInfo.access_token!=null){
                String requestBody = '{"req":{"accounts":'+JSON.serialize(castRecords)+'}}';
                Http http2 = new Http();
                HttpRequest req1 = new HttpRequest();
                string endP = 'https://eu6.salesforce.com/services/apexrest/getAccountData';
                req1.setHeader('Authorization','Bearer ' + objAuthenticationInfo.access_token);
                req1.setHeader('Content-Type','application/json');
                req1.setMethod('POST');
                req1.setBody(requestBody);
                req1.setEndpoint(endP);
                if (LOG_THIS_CLASS) System.debug('end point : ' + req1.getEndpoint());
                if (LOG_THIS_CLASS) System.debug('end point : ' + req1.getBody());
                HttpResponse res1 = http2.send(req1);
            }
        }

@RestResource(urlmapping = '/getAccountData/*')
global  class accountRestService {

    PRIVATE STATIC FINAL BOOLEAN LOG_THIS_CLASS = TRUE;

    global class requestBody {
        global List<Account> accounts;
   }

    @httpPost
    global static List<Account> populateAccountObject(accountRestService.requestBody req){
        if (LOG_THIS_CLASS) System.debug('the request in populateAccountObject.. : ' + req);
        insert req.accounts;
        return req.accounts;
    }
}