There is nothing particularly wrong with Lithium Ion batteries and they are used in most mobile devices and electric cars. However, they need to be used and charged correctly but that's true with any battery. That said, Lithium Ion is probably not the number one choice for powering a mount/camera/computer. But, how often can you afford or even find the absolute best in anything?
If I had to rate battery technologies regardless of price then the ordering would be (from worst to best):
A typical lead acid automotive battery (I don't recommend this under any circumstances, although it can work)
Deep cycle AGM lead acid
Now, each of these technologies comes in at various price points when looking at capacity. Generally speaking, Lithium Ion and particularly LiFePO4 are the most expensive (YMMV) but each of these battery types has a higher energy density than lead acid batteries and that means they can be both lighter in weight and smaller in size than an equivalent capacity lead acid battery.
Also, you shouldn't choose any of these batteries without doing a bit of your own research on things like charge cycles, true capacity at 12VDC, and safety. LiFePO4 may be the current favorite in terms of charge cycles and safety but it can also be the most expensive (again, YMMV). For that matter, deep cycle sealed AGM lead acid batteries are easy to use and very safe but they are much heavier per unit capacity than the lithium or LiFePO4 batteries. Lithium Ion can be nice because there are generally more product types with that battery type than with LiFePO4.
A few years ago based mostly on price and easy availability I decided to go with small (34Ah) deep cycle AGM batteries that I could array in various configurations (one for the mount, one for the computer and cameras, and a third either as a spare or for dew heaters). In terms of capacity one of these batteries can keep my mini PC and cameras (with cooling) running for at least 8 hours and if I need more than that I can easily hook two of these batteries in parallel.
Today, however, it looks like it is possible to go with LiFePO4 for only about a 50% increase in total cost over a similar capacity deep cycle AGM battery (except that high capacity LiFePO4 is still very expensive -- think $500 to nearly $1000).
In any case, I'm pretty close to trying a smaller capacity and inexpensive LiFePO4 that can currently be found on Amazon for only $50. It might not provide the same runtime as one of my 34Ah AGM batteries and it might require some additional circuits to run in parallel (only with another LiFePO4) but the price is certainly attractive and it is much lighter in weight than any similar capacity lead acid battery.
Edited by james7ca, 02 July 2020 - 11:13 PM.