The following batteries have the most questions about the items:
BT-BP-30182K - The biggest question about this isn't the battery, it's the compatibility. Most customers are unaware there are two different models, the Xperia Z1, and the Xperia Z1S. This battery is only compatible with the Xperia Z1.
BT-BP-30064 - This is one of our best selling products. There are numerous questions about compatibility, and most people confuse this battery with the Galaxy Note Edge battery.
Motorola Batteries - Motorola batteries are some of the most confusing batteries, because they typically work for multiple phones. It's always a good idea to do a quick Google search if a customer has a question about compatibility. We've tried to get our listings to be 100% accurate, but it never hurts to double check.