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Using commercially available Ni-MH batteries (2500 mAh or more) in my CT-S1, I haven't been able to get anywhere close to 3 hours' use out of them as per Casio's specs...I've tried different brands, all fully charged, and they all seem to last about an hour before the LEDs start blinking, indicating low battery voltage...the other night when this happened, I checked to make sure the battery type was set to "Ni-MH", and it was, so I changed the setting to "Alkaline" and the LED flashing stopped - then I was able to use the CT-S1 for another hour-and-a-half before the LEDs started to flash again...during this time, I tried resetting the battery type to "Ni-MH" again a couple of times, and when I did the LEDs would start flashing... Could the Quick Start guide and User's Guide have the battery type settings reversed, so that "1 tone" actually indicates the setting for "Ni-MH", and 2 tones for "Alkaline"?...looking at typical discharge curves for the two types, I see that while alkaline batteries have a higher initial voltage, their discharge curve is steeper than Ni-MH's...so presumably if set for "Alkaline" and Ni-MH batteries are used, the CT-S1 (after an hour or so) would interpret the lower Ni-MH voltage as nearly discharged...??? df

I have been enjoying my Casio WK-1350 for years. I have been plugging it into the wall for its power source. Today I thought I would try unplugging it from the wall and powering it with 6 D cell batteries. When I pushed the Power Button on the keyboard nothing happens. Any suggestions ! ? ! thanks !

Hello. This thread possibly involves two separate issues. There's some noise coming out of the phone outputs of my PX-5S, one that is there at a constant volume regardless of what volume is the PX-5S set to output. I think I read about this somewhere, but I couldn't find that exact issue being cited when I searched for it at the moment. Anyway, it's not super-strong, but it's quite audible and you notice it as soon as the keyboard is turned on. I don't know whether that's regarded as "normal", and as the output volume doesn't affect the noise level, I thought perhaps it's some ground noise from the AC adapter. So, I tried running the PX-5S on 8 Duracell AA batteries – it doesn't turn on! Why is that? I've put them in correctly. Is there a chance something's wrong with the wiring that should go from the battery compartment? Thanks in advance.