That's been my only complaint about the G6 batteries so far. I expect a short charge life from a small battery, but the vapor production falls off before the battery blinks to indicate a low charge. It's gradual so I don't always notice it until I switch to a fresh battery and... whoah! There's the vapor!
The Volt batteries cost the same so I'd like to try one next time. It should be compatible with the G6 charger, yes?
I'm not sure. I know they usually say not to use a charger from another brand. I'm quite paranoid when it comes to charging these batteries, so I've always stuck with the charger for Volt when charging a Volt and such.