This isn't limited to Canon cameras per se, but I just realized that I've collected a number of dual USB battery chargers for my LP-E6 batteries. They plug into and run from any USB power source (they can run on a 1-amp source, but that makes for an overnight battery charge--a 2-amp source is better).
They're not as rapid as an AC charger, but I've also collected a few big 16,000 mAh power banks to recharge all my other devices...and those can recharge LP-E6 batteries as well. At this point, I'm pretty heavily set up to go from AC to power bank to multiple types of devices, at home, in the car, or on the run.
My AC battery chargers are gathering dust.
