I expect these to be the same, the fn one works but the recur one gives me a java.lang.IllegalArgumentException: Mismatched argument count to recur, expected: 0 args, got: 1. Any ideas?

batch-lazy-seq-with-fn.clj

(defn batch-lazy-seq
  ([] (batch-lazy-seq 1))
  ([start]
    (let [batch-size 10
          end (+ start batch-size)]
      (println "Loading batch" start "-" (- end 1))
      (lazy-cat
        (vec (range start end))
        (batch-lazy-seq end)))))

(doseq [n (batch-lazy-seq)]
  (println n))

batch-lazy-seq-with-recur.clj

(defn batch-lazy-seq []
  (loop [start 1]
    (let [batch-size 10
          end (+ start batch-size)]
      (println "Loading batch" start "-" (- end 1))
      (lazy-cat
        (vec (range start end))
        (recur end)))))

(doseq [n (batch-lazy-seq)]
  (println n))