Do we know what the preset temps are?
edit: Answered my own question by changing the temps with the app open. Here they are in case anyone cares:
Temp 1 - 520F
Temp 2 - 610F
Temp 3 - 700F
Temp 4 - 790F
I would recommend against purchasing batteries off a random seller on Amazon. There are many fakes out these days. Best to purchase from a trusted vendor.
Call the number on the back of the card and ask. All the RBT website knows is that it transmitted the payment information and the CC issuer declined it.
edit: Or were you using PayPal?
The battery compartment is not sealed. A venting battery would vent through the holes where the LED shines through. It should not be able to build up enough pressure to turn into a pipe bomb.
My hopper apparently jumped out of its box on the journey from London to the US. It has been stuck in Tennessee for a week. When I called they said the package was received "empty". But they could not tell me anything else, like how they knew it was "empty" or whether the box was damaged. Vendor...
AFAIK the only difference between I and D are the screen. Get the D2.
edit: here is a link to a D2 sold and fulfilled by Amazon. Much less likely to be fake, and should be the latest model.