Please could you advise me. I often observe on a remote site reached by car. I have a Celestron CPC 925 telescope, and have problems with Dew. There is a vast range of expensive dew heaters and shields available, sold separately from their power supply. I need my 12V car power supply for the main drive. Whats the simplest way to heat the telescope to prevent dew formation with this setup? Will I need another rechargable power supply?
I would suggest that you get a >10Ah power pack manufactured by Celestron or SkyWatcher or such like. Just check that it has the right 12V output sockets for your dew heater straps (but I expect you know this!).
I have a Celestron lithium mini-tank also – it is useful for illumination and USB charging, but no good for the more demanding peripherals!