Which is the fastest way to recharge Lumix batteries while in a vehicle, with the battery out of the camera? e.g. G9 battery
I would think if the OEM one that came with the camera is faster than any of your third party chargers. in a car it might still be fastest with the OEM AC charger. Just add a car inverter to give you a (for USA types) 120V AC plug and plug your normal "house" charger into that.
Of course I don't own any Panasonic bodies and therefore no experience with their batteries, so take my comments at the same value you paid for them.