The following are known Action Replay Codes for Batman Begins on Nintendo Game Boy Advance (GBA).
These codes were also known as GameShark Codes and in most cases will work on both devices.

These codes are for the U.S. version of the game.

Master Code – Must Be On
0668f3bd
30a87221
16b39d6b
b0f6f71d

Infinite Health
3099b99b
55df6e02

Infinite Time
5984458c
42c743a1

Infinite Flashbangs
fb4cc6ab
3e513062

Inf Smoke Grenades
e43952d3
bd7a6338

Infinite Transponder
27353a34
f1c1f6f8

One Hit Kills
294e3e89
7c8b5209
25260c8d
25207dae