"So then I found this power bank: RAVPower 23000mAh Portable Charger
That is 23,000 mah at 20.8 ounces and has an additional multi-volt DC port."
OregonSteelHeader: When I researched the 23000mAh RAVPower RP-PB14 powerbank myself, it appeared that its digital display stays on 100% of the time while its being used. As you can see from my test results, leaving my Rino's display on while charging produced the worst loss. Even eliminating the USB meter (which alternates displaying voltage & amperage) helped to reduce the loss percentage. Shortening your cables as much as possible also helps. Before you purchase this powerbank, I'd recommend that you download its owner's manual from RAVPower's website. In it, I found a worrisome clause that states that it's normal for 20% of the total capacity to be lost.
Several other forum members (Dotman & Dog812) have used the variable output 10000mAh XTPower model MP-10000, and say good things about it. This is the same portable charger that was formerly marketed as Anker's Astro3 10000mAh Multi-Voltage external battery pack. I probably would have bought the XTPower myself, but it's 9-15v input isn't compatible with the 5v USB output of my solar panel.
"...those results you posted are poor, it's surprising that none of the Amazon reviews mention such a loss."
Many folks that review powerbanks don't understand that a mAh rating doesn't factor in losses, and is valid ONLY at the internal battery's voltage of 3.7v. There's huge decreases to the mAh that occur when the internal voltage is boosted to 5v, 9v, or 12v. I didn't fully understand the relationship myself until I found and read this online article:
Discover the real capacity of your power bank.
"What's the weight & mah total of the 18650 AiLi battery pack that you're building?"
There are two Chinese companies (Qidian & AiLi) that manufacture variable output battery boxes. These are lightweight 4 to 6 cell enclosures that contain the appropriate circuitry and are shipped empty to you. The idea is that you carry just enough rechargeable 18650 Lithium-Ion cells for the particular trip you're planning. For example, if I can reduce the system losses down to 20%, I will carry enough 18650 cells to equal my solo days out minus 2. In other words, I'll carry 12 individual 18650 cells plus the AiLi charger for a 14 day solo trip. By the same token, I'll only need three 18650 cells for a 5 day solo trip. Even though its more of a hassel, I prefer to treat the electricity I carry like food - just carrying what I need and no more. The AiLi model 109 that I bought weighs 91.7 grams empty and each 3500mAh cell weighs 47.8 grams.
"I was going to run the Anker PowerCore+ 26800 USB battery pack and the Kunco 5V to 12V booster."
The variable output AiLi system that's equivalent to the Anker would require eight 18650 cells (totaling 28000mAh total at 3.7v). I calculate that that charging system will weigh 503.3 grams or 17.75 oz. Compare that to the weight of the Anker power bank plus your Kuncan 5v to 12v boost module. Recognize that you WILL have a huge reduction in mAh when you boost the 5v USB output of the Anker up to 12v in order to charge your radio. I'll carry the AiLi battery box if it reduces my losses down to a manageable 15 to 20%. Time will tell, as the new equipment hasn't arrived yet.
I like the concept of this DIY charging system because it allows me to carry just the amount of stored electricity that I figure I'll use. The recharging system that I'll carry for shorter duration trips will weigh much less.
Like most things, the analysis of which charging system to use is more complicated and involved than it appears at first glance. Hope this helped and that it didn't muddy the water....
Clomp