What Mark has suggested is the best option. I would also recommend getting a separate solar panel and a USB battery bank.
I would steer clear of the "all in one" solar panel and battery banks that you can find out there, including ones with a built in LED torch. I've posted this before, but in Australian conditions, these don't work well mainly for these reasons:
- their small solar panels provide too low a current to charge the attached battery bank fully (usually at a rate that it would take a number of days of sunshine to fully charge). If you need to use the battery bank daily this will become an issue that you will use up the battery faster than you can recharge it with the small attached solar panel.
- lithium batteries usually shut down charging via the charging controller (for safety) once the temperature gets over around 40 degrees, which is easy to do with the battery pack being attached directly to the solar panel.
Mark - the Ikea Vinninge charger is a nice looking charger, but it is quite the slow charger. Only outputting about 220mA charge current, it takes around 10-12 hours to fill up an Eneloop AA. For a better AA charger I take my Xiaomi Zi5 4 slot USB charger (which weighs around 51g without the plastic cover). You might not need the 4 slots, so consider also a Liitokala Lii100 single slot multi chemistry NiMH/Li-ion charger which comes in about 44g. The Liitokala I mentioned in another thread
viewtopic.php?f=21&t=22730&p=305448#p297189 can also act as a USB powerbank.
Also you might be interested - I have just ordered a nifty super compact NiMH/Li-ion charger which I hope to use as a backup charger and with my solar panels. It is the Olight universal magnetic charger
https://olightworld.com/store/flashligh ... harger.htm It comes in at about 22g, so is a bit heavier than your stripped down Miller charger, but it is able to charge both NiMH and Lithium batteries. It uses magnetic connectors and can be attached at either battery terminal as it will determine the correct polarity. I will post a review on how well it works with my solar panels once I get a chance.
This is what it looks like:
- Olight UC Charger.jpg (52.69 KiB) Viewed 12531 times