TechniSat DIGITRADIO 231 OD Manual page 150

If your battery type is not listed, check the height of your battery. If this does
not exceed 65 mm, the battery should fit. This means that future, new battery
generations from the above-mentioned manufacturers may also be compatible
(no guarantee).
150
DeWALT
BL1860B Li 18 V/6.0 Ah
DCB182 18 V/4.0 Ah
DCB183 18 V/2.0 Ah
DCB184 18 V/5.0 Ah
DCB185 18 V/1.3 Ah
DCV184B 18 V/5.0 Ah
DCB183B 18 V/2.0 Ah