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First, thanks for all the responses guys!
Since I made the post I have indeed found quite a bit of info on Ice about power options, all great information. In particular, StarDrifter, I found quite a lot of unhappy campers on the net who've had their Celestron power tank fail for one reason or another.
So I'm going to go with an off-the-shelf 12V battery (probably a gel) and compatible charger. That way I can control exactly what I'm buying and learn how to use the gear correctly (plus if I do bugger something, it'll be easy to get a replacement).
I also fly large radio-controlled helis that run on pretty scarily big LIPO batteries (the kind that are serious enough to explode if you look at them sideways) and I know from that experience that recharging is the crucial part if you want to get good performance and lifetime out of your batteries.
I had a Meade 10" SCT many (i.e. 20) years ago, and that just ran on ordinary batteries, plus had an AC adapter supplied with it, so I was a bit caught by surprise by these modern mounts being without either. So all your information has been a great help, so thanks a lot!
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