I can't seem to find them unfortunately but I would go for a Nitecore D2 or D4..It charges everything (including Lithium Ion, LifePo4 and NiMh etc) and the price is good at the moment for what you get! Will also charge using an 12V auto cigarette charging point.

http://www.amazon.com/NITECORE-version-I...rds=notecore+d4
c
It won't charge from USB but a USB to 12V step up onverter can easily be made! I am currently using one to step up 2x18650 cells to a 12V rail power system for a home made Night Vision Sight System for a Crossbow.

Various Buck/Boost step up/step down Converters modules;

https://www.youtube.com/watch?v=5IbzQl-2q7Y
https://www.youtube.com/watch?v=vUb5xu72hvQ

Each of my car kits contains a WakaWaka Power+. It holds 3750 maH, can recharge our phones (but not tablets), recharges itself in almost any natural lighting conditions, and of course provides a light as well. I'd carry something with more solar wattage if I expected more use than "charge the phone and call someone".

I have a D4 at my desk and a D2 in my car. Highly, highly recommended.

AFLM... thank you... I'm topping off the Eneloops in case TS Erika becomes naughty

During the last 3 nights camping, I had a great success with the same as Les' GoalZero Solar panel + Guide 10 + similar to Chaos' WakaWaka 3Ah LiPO with small solar panel on the side (but about 5 times cheaper ;)). They were charging Samsung Note 3 phone, Samsung 10.1 tablet, and a midrange LG Android phone - all being in intensive use only in the evening time (3-4G Internet, BT, GPS, Maps, Games, Movies), and charging in the sun most of the day time. I have never saw less than 50% charge left on either of the three. For emergency calls I'm keeping a fully charged spare battery for my Note 3 - it's really small, and also another 4 AA eneloops for the Guide.

All of that is riding either in my tiny Canon camera backpack (along with camera gear, including 3 Lenses), or in the even smaller hydration backpack, surely with all the other essential survival gear and supplies in both cases.

Also, I have the 22Ah gel battery in the car's emergency jump starter (upgraded the regular 12Ah Husky jump starter once). Oh, and another 6V SLA battery is in the mattress air pump. I have spliced its charging cable, so I can easily draw power from it in case of emergency.

I have a crank power flashlight with the 12V cigar lighter socket somewhere deep in the car as well, however it's not powerful enough to charge a modern phone directly, should probably try it with the Guide 10 instead.

One of the sources missing is chemical energy. Trying to procure russian salt water flashlight-generator: http://veslo.ru/2006/snaraga/svel/svel.html (in Russian) still no luck.

And thanks for the NiteCore tip. Found it on eBay for just $9.59.

[censored][censored]" rel="nofollow" target="_blank">http://www.ebay.com/itm/Green-House-Salt...=item4aef8e3342 No specs, but there is a same "120" number on the image of the box.

Sure thing it's just a weird option. And not a very sustainable one (if you run off the supply rods...). I believe modern solar panels are the way to go, just don't rely too much on small ones, get a 150W one, it works in overcast. For portability I'd go for film panels.

I am currently working on a project building a generator powered by a takedown Savonius rotor. That may be used "on the go" or while having a rest.

Speaking of on-the-go charging.

Here's a simple question. I have not sat down to figure this out. Suppose you want to carry enough solar panels to charge your cellphone in a convenient time. How much area do you need for the solar panels? I am talking about a charging time of say ... 45-60 minutes. For a modern cell phone, like an iPhone 6 or an Android.

I am trying to see how practical this is. There are small "portable" solar cell units that are sold in wilderness stores. They actually roll up into a convenient carrying package. But I am not clear if they will really charge a cell phone in an hour. If it takes all day - that is far too long.

cheers,
Pete

Just for an example:
An iPhone 6 can be charged to 90% in two hours with an 2.1A power adapter. I would not try to reduce the time with higher currents due to thermal issues. A 45W panel has a nominal output current of around 2.1A at an area of roughly two by four feet. A 20W panel has roughly 1.1A nominal output current at an area of roughly two by two feet.
The charging times will depend on how far you deplete the battery.
The actual output depends on the panels technology and may differ from numbers above. It still should give you an idea on how practical it is.

The approach many people take to this problem is to use a solar panel to charge a battery with a USB charging port on it.