I live in the US. The chargers look like they'll work together. For example, the Kindle charger will make my pocket camera light up its charging light, but aft

I live in the US. The chargers look like they'll work together. For example, the Kindle charger will make my pocket camera light up its charging light, but after a minute or so, it goes out, as if the charge has completed. In fact, though, the battery is still dead. The other combinations of cell phone / camera / Kindle chargers are similar.