Moving to Lithium field battery

Since the 1990’s I have used Sealed Lead Acid batteries for powering my astronomy and astrophotography equipment.

When I was routinely using a laptop in remote field locations I was using at first a 40Ah SLA battery and then later a 120Ah SLA battery which was left in the boot of the car, a cable running to the telescope and other equipment such as laptop, USB devices, dew heaters, etc.

Curiously, for my portable rig the power demands have reduced in recent years. A combination of location and type of imaging. Running the mount with a small modern auto guider and someone else’s DSLR doesn’t require very much power. These sessions usually run for less than 4 hours which means a laptop can power its self for that time, no need for external power. Also in more recent years the need for battery power has reduced. Often my workshops are located at my private dark sky observatory where I have mains power, or at the Perth Observatory where I have mains power. If I’m not imaging there, then there’s a good chance I’m using my permanently mounted rig instead, that of course runs of mains power So, in recent years my power requirement had dropped to a 9Ah SLA battery.

Looking forward to the 2023 Total Solar Eclipse in Exmouth, and wanting to up the level of functionality in my workshop telescope rig, and looking at needing to buy a new 9Ah battery due to degradation of my existing, had me looking at alternatives which would be sufficiently over-specified they would provide for almost any workshop scenario.

The new astrophotography lithium battery

I hunted around for a light weight high capacity battery and came across

I’d seen a whole world of modern battery options, moving ahead from a simple battery with two terminals that I would need to DIY connections for. This is the direction I wanted to go.

I ended up choosing the “Outdoor Power Bank – 96000mAh (Solid Black)” pictured above. This large battery weighs only 3kg but packs a huge amount of power. It has dual cigarette lighter style outlets. it has various USB outlets.

I plug the Losmandy and ZWO ASIAir Plus directly in to the two 12v sockets. Sometimes the USB is used for powering the Prima Luce ESATTO focuser when I have been using that. I regularly have an iPad or iPhone plugged in to the USB outlets.

I have occasionally powered my Dell XPS15 laptop off the unit via a 240v inverter and the laptop’s supplied power supply.

The lowest I’ve had the battery so far is 2-3 bars out of 4, about 50-60%. The battery has been 100% reliable. The length of time it lasts combined with being Lithium type battery means I have no concern about running out of power and only charge it now and then, not after every workshop even if my workshops are weeks apart.

The unit has a bright diffused light on one end which has occasionally been useful for floodlight of a workspace to find lost screws and such on the ground.

The only thing I wish is that it had built in AC charging. It’s a shame I need to carry around a 12v power supply plug pack to charge the unit when I travel remote. That said, it’s taken only for caution because even a full weekend this unit will not run out of battery power for me.

More Blogs

This is part of a blog series regarding my updated workshop telescope rig