I watched Julian's videos....in fact, that is how I learned about it. I have been using lithium ion batteries of various chemistries for some time in building high powered hand held lasers. Some of them, like one diode that requires 4 to 4.5 amps, require the battery to be able to deliver a high current surge I have used sizes up to 32650 but I have not been keeping up have no experience with lithium iron phosphate batteries.
Julian....and frankly all of his content, I find really impressive. In fact, when I described what I wanted to do, he suggested that I probably only need one 10 to 20 amp hours in size when you consider that even if I went out for ten hours at a time, satellite passes are only about 15 minutes in duration.
He even suggested, and I can understand why, not adding the complexity of a battery management system at this point since I am not going solar, but to just use a Tenergy or other RC balance charger. Instead of a BMS, just a low voltage disconnect device of some sort.
I think the charging is similar to the other lithium chemistries I use....constant current up to a certain voltage. For the batteries I have been using, it is 4.2 volts but for these I think it is 3.2.
So, a basic pack for amateur use is always 4S.
Now, if I can only find out and find a barrel connector for my Dell Lattitude laptop!
Any recommendations for a low voltage cut off?
I just wanted to see if anyone else had experience with using them.