I use two
TRACERS
https://www.widescreen-centre.co.uk/...tery-pack.html
and Celestron
https://www.widescreen-centre.co.uk/...powertank.html
I find what people call Power Tanks far too heavy and the new LiPo batteries are great
The Tracer I use for my mounts, the Celestron with dual USB power, (two different amperages) powers my mounts and also now powers my Solar tracking mount AND Daystar Ha Chromo filter all in one, in case you don't see it, there are two usb outs on top, 1000 and 2100 mA and a 12v on the side
On rare occasions who needs an expensive power tank, I simply take my old car battery and an inverter away with me