Re: Kurzweil K250

Regarding the Kurzweil K250 sound output issues. A few days ago there was very little sound coming out, so I sprayed the outputs with an electronic spray thinking that there may be oxidation causing the problem. One hour later the sound returned to its normal level.  Then about an hour after that back to the very low volume. Does this unit have a battery that needs to be replaced? Thanks for your help.