Battery for Rolleiflex SLX and successor models

For exchanging the batteries you need only a tiny Phillips screwdriver (SwissTool size 00), a soldering iron, electrical tape and little thermal paste. The old batteries have a cargo capacity of 500 mAh. The new cells store a total of 700 mAh and the voltage is 8 x 1.2 V = 9.6 V.
For conversion: In half an hour everything is actually done. Remove the two small Phillips-cog and pull the cap with the gold contacts. In cellblock twofold thermal fuse is installed. This pull out. The block unsolder and solder the new block in the correct polarity at the two solder tails again. The assurance I have omitted because it is (abundant use on world travel) never happened in over 30 years that has blown. The two heat monitoring with thermal grease slide between the cell block again. The two plastic shells attach to either side of the battery pack, making sure that all is well insulated from the metal housing (electrical tape). Then slide the entire block in the correct orientation in the housing and replace the two tiny little screws again.
Charge the battery; done!
Assuming the battery lasts 3 - 4 years, good value for money, highly recommended.