New Battery 3.6 volt 

For:

 Siel DK600  - synthesizers 

This Battery allows you to replace 
the original lbattery with a 3.6 volt rechargeable battery.
 Installation requires soldering, 

Be aware battery leakage will have damaged the circuit board itself
 and this will require repair in addition to the battery replacement 
This for those with experience at repairing electronic equipment