Vintage Simmons Drums (UK) Users Group

Hi Scott

I used a varta PCB battery from Maplin:

2/V150H 2·4 150 345 13.0  417 BN23A (Maplin's code)

I found that all the brain settings that had faded were instantly 
recalled once the battery was securely soldered in place. You could 
probably use the 3/V150H 3·6 150 345 19.2  417  BN24B item as I
had 
to stretch the pins out a bit but the existing battery is flat so 
both are compromises. The important bit is the 150 Capacity (mAh) 
It's a three pin battery and you have to remove the 'settings number 
pad selector unit' (four screws and pcb multi-pin lead). You will 
probably find it easier to remove the brian casing as well as I don't 
think there are slots for the board to come out. The PCB with the 
battery on is the second from the right (from memory).

I took the opportunity to dismantle the whole drum brain and clean 
all the boards and selector unit but that isn't really necessary. 
Just be careful to desolder the existing battery gently as you don't 
want to fry the other mounted components!!

regards

Stephen