Vintage Simmons Drums (UK) Users Group

hi people,
i've got a problem with the SPM 8:2 mixer i recently bought 2nd hand; 
being that the machine will power up whewn turned on, but after a 
short while it'll turn itself of again, after which it sometimes 
takes a short break and repeats the process, but mostly it just stays 
of then, until i throw the power switch off&on. my best guess is that 
the cause of the problem is a dead internal battery; i've found it 
and the plastic cap reads NC-M 110 EMMERICH. i've also determined 
that i'd have to desolder it from the pcb to replace it, which is not 
a problem. but i'd like to know if this is actually the problem 
before i take the whole thing apart to access the battery's soldering 
points. any tips anyone?

thnx, Chiel