Hypergravity compressor and battery use

Hypergravity compressor and battery use

Hi, I have a new hypergravity comp (the second, because the first had on/off problems and it was warranty-substituted).
I’m disappointed because my HG works only few minutes with a new 9V battery! I mean 4-5 minutes and then it stops.
I have a power supply and with it all is OK, but sometimes it’s useful for me using battery.
Technical service wrote to me that “using battery is not an option” due to the high power consuming DSP inside the HG… But 4 minutes are really annoying!!!
Has anyone the same problem? Is it normal?
Did someone try with 600 mA rechargable battery (theorically HG uses 100 mA)?
Thanks in advance

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Source: http://forum.tcelectronic.com