my minty boost is hot glued into the tin, is there anyway to get it out?
You could try heating it gently (heat-gun, hair-dryer) from the bottom of the tin.
I am using Duracell battery's
Duracell makes many different types of batteries. Duracell-Ultra are designed for high-drain applications and generally work well in the Mintyboost.
Also the charging icon at the top of the iPhone switches between a charging symbol and a plug symbol. Also when it's on the plug symbol I doesn't charge, and since it switches between those 2 symbols It doesn't really charge at all even though it says it is!!!
It sounds like the phone thinks it is connected to a high-current wall-charger and is trying to charge at a higher charge rate than the Minty can keep up with. Did you short together D1 & D2 on the USB connector? The iPhone 4's usually work well in that configuration.