LongJohn

I've done this before with an old Roland eP7. I used a 12v sealed lead acid motorcycle battery. I think it was a 7Ah version, i.e., able to theoretically supply 12v at 7amps for 1 hour, or 12v at 700mA for 10 hours. I made up a power cable with a couple of croc clips on one end for the battery and a DC power connector on the other to match the one on the eP7. I used it for an open-air service along with a couple of battery-powered PA amps. Hardly used any charge from the battery at all. The same system should work with the SK1. I use an SK1-73, but haven't had occasion to try this. I'm not sure what the current consumption of the SK1 is, but I could measure what is for the SK1-73. Shouldn't be much different.