1 files changed, 25 insertions, 0 deletions
diff --git a/ocaml/lib/year2025/day03/part02/battery.ml b/ocaml/lib/year2025/day03/part02/battery.ml
new file mode 100644
index 0000000..e8f0443
--- /dev/null
+++ b/ocaml/lib/year2025/day03/part02/battery.ml
@@ -0,0 +1,25 @@
+module Battery : sig
+  type t
+
+  val of_int : int -> t
+
+  val to_int : t -> int
+
+  val to_string : t -> string
+
+  val compare : t -> t -> int
+
+  val pp : t -> string
+end = struct
+  type t = int
+
+  let of_int i = i
+
+  let to_int b = b
+
+  let to_string = string_of_int
+
+  let compare = Int.compare
+
+  let pp = string_of_int
+end