Power pack / dew heater Camera advice

[keramos]

Hi All,

After being away for a long while I've decided to dabble in the DSO imaging (thanks to Neowise for the inspiration).

Currently mulling over a portable mount either Explore scientific iEXOS-100 or iOptron Smart EQ pro+ (at the moment iOptron Skyguider not in contention). Needs to be portable and have goto (i'm rubbish at star hopping).

Therefore need advice on two things:

1) Power pack

One that can support at least 4-5 hours of imaging with the following:

• Main Camera - ASI174MM USB 3.0 or ASI 1600MM (at later date)
• Guide scope camera (ASI120MM)
• Dew strap x 2
• Dew controller - 4 ch
• Filter wheel
• ASI Air
• Mount - hoping this should run off LiPo battery pack (that comes with the mount) for the duration

If some of you kind folk could advice on power pack/tank that would be helpful. 

• Would I also need some sort of power supply regulator to prevent damage to equipment?

Budget ~£200

2) Dew Heater strap

 I'm getting two - one for main scope and guide scope.

Do I need for main camera and guide scope camera?

ps: I have a skywatcher power pack but that doesn't seem to hold charge.

Any help will be appreciated.