I am wondering what people are using in the field for keeping batteries charged. In the US, things are pretty simple, but what about wilder places with 220v at the plug to remoter, but not isolated parts of the globe? It is a basic question, but googling for various options gives nothing up in terms of managing the various voltages and charges on the road. Currently, I am looking at charging batteries for a DSLR, and the AAs for the Hyperdrive and Speedlight Flash. Any LSers care to share their set-up or approach?