Ikelite NiMH battery module with "O" ring for DS-125, DS-160, and DS-161 Rechargeable NiMH battery pack #4066.5 is compatible only with Ikelite's DS125,DS160, and DS161 strobe. It is the only battery pack usable with the DS125, DS160,and DS161. The rear section of the strobe is the NiMH battery pack for the strobe.