Hello, Jason.
I am a rep from Smoke For Penny's®. I apologize for the misunderstanding here. We as a vendor receive multiple bulk shipments from manufacturers and over time the make of a particular model of battery can and does change. I assure you, the only type of Passthrough we carry is the 1100. The 1100 you received has a newer make with better inner workings, giving it a more compact design.
Another example of this is the E2 1300 we just got in. It is actually much smaller than our 1100 version. It does not mean that we are cheating customers with less powerful batteries. It is simply the nature of newer design, and more compacted technology. See your iPhones for an example, as the technology advances the smaller devices become more powerful.
We have went ahead and shipped you the larger model of the 1100 and hope that meets your expectations. We at Smoke For Pennys® strive for the best customer service and vaping experience possible for our customers. So you can keep both Passthroughs, with no additional charge.
Sincere Thanks