The Tektronix 1104A is a battery pack for the 2225.
Option "Opt. 07" for the 2225 adds an internal inverter so the scope can run on 12 VDC. That, plus the 1104A battery pack, enable the 2225 to be battery powered. Option "Opt. 30" for the 2225 includes Opt 07 and an 1104A.
1104A
1104A
1104A