Let’s be completely honest. For a base camp, sometimes a charger makes sense.
For the Appalachian Trail, they are a yearly question and they don’t work. Too much time in rain, clouds and under the tree canopy.
But on the PCT I carried two Nitecore 10 mah batteries and Win carried one and a Lixada solar panel.
For the same reason you will live in a sun hoody, the panel works to trickle charge a battery through the day.
Many devices won’t accept that kind of charge. Many people use too much power. But on airplane mode iPhones and not much else you can do well on most of the Pacific Coast Trail with the smaller, cheaper, lighter of the two smaller Lixada panels.
Of course you can probably make do with just one 10000 mah Nitecore rather than two like I carried or one + solar. But it gives you a little more flexibility.