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Thanks for the replies!
I'm going to check these out.
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Remember, the plethora of 5v USB chargers are vastly overrated and so you want to get the biggest one you can afford, like the Anker 21w PowerPort if you're running a 4 bay charger like the Xtar VC4. While many are rated for 2.1A smart phone charging, they tend to come up short in that department.
With the 2 bay chargers like the Liitokala 202, you're a bit less concerned and 1A charging is doable for 2 bays. Of course, you're down to only 2 bays, so that's a concern, but many of these USB solar panels give you two ports to charge.
I think that I paid $7.75 for my two 202s and $3.75 for my two 100s from GearBest, so they're cheap enough to buy a few and stash them away in cars, or other places.
They're quite flexible and will charge up NiMH, li-ion 3.2v, 3.7v and 3.8v (3.6v, 4.20v and 4.35v hot off the charger) cells. They can also act as a power bank for charging up stuff with freshly charged cells, even though they're a bit noisy due to digital hash.
Chris