Hi Mate i have one of those and as you say it needs a bit of oomph... i'm just running it with the PP3 and its ok for crawling to the point of focus, as i have one attached to the rear top left of my 127 SLT tube via the skywatcher supplied bracket fixed in place permanently with Araldite 5 minute epoxy along with two custom cogs for the focuser and one for the motor along with a rubber toothed belt as i did not even dare drill holes for that motor bracket near the rear of the OTA next to the mirror. the focuser movement on the 127 SLT is quite fine to focus so that too much either way it gets blurred so the slow movement on the hand control suits me fine , the PP3 battery seems fine but i have never really used up all its power so dont know how far it would go before it ran out. I have 5M cables for the focus motor extension cable & the starsense hand controller along with the camera cables straight to my room window and the skywatcher powertank connected all that to the laptop through CPWI telescope control.