Vintage Simmons Drums (UK) Users Group

The SDS1000 is essentially an SDS9 in a rack, and it uses serial EEPROM for 
patch storage - so no battery there.  I'll check the SDS9 schematics when I 
have time to confirm it's the same, but it won't be this week...


Steve

All SDS9s I ever opened had batteries (I wish they didn't...). They are located on the solder side of the big board and cause shortcuts on the workbench, if you forget to put a newspaper under it. Voltage is 3.6V, replace it with NiCad, not Mh. 
Michael

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