The Rollei 35 TE , SE and LED use a 5.6volt mercury battery which is also now illegal
in most of the U.S. You can get an adaptor that uses button cells to replace this battery at CRIS.

C.R.I.S. Camera Services
250 North 54th Street
Chandler, AZ 85226

Be sure to let them know the make and model of your camera.

https://www.criscam.com/    Webstore     Mercury battery adapters