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.