DIY portable mount power

[Dinglem]

I've been contemplating making a portable power box so I can take my mount to a dark site, a friend gave me an old lorry battery that no longer turns the engine over but will hold some charge. My intention was to get a nice enclosure and build something that looked professional like a few other members have created on here, unfortunately spare time is limited so I went for a simpler solution and created the following and it works very well.