A new Motorola device has quietly passed through the Federal Communications Commission (FCC), and it is believed to be a bigger, better, second-generation Droid Turbo.

Droid Life reports that model number 5137 could be the next flagship smartphone from the Lenovo-owned smartphone maker. The phone, with FCC ID HDT56UC2, appears to sport a 5.5-inch Quad HD display, which is slightly bigger than the 5.2-inch current-gen Droid Turbo. It has support for LTE Advanced carrier aggregation and works with Motorola's fast-charging Turbo Charger.

The filing hints at support for GSM bands 2, 4 and 5, which should make the phone ready to be used on AT&T and T-Mobile's networks. All LTE bands, except those used by Verizon, are also supported, which causes confusion as some of these are Sprint bands, although the phone seems to show no signs of CDMA compatibility. This has raised speculation about the device possibly being compatible with Google's Project Fi, which uses T-Mobile and Sprint's network to deliver wireless service.

The device is also said to be compatible with Motorola's Turbo Charger, which the company claims can give the phone up to eight hours of battery life with just 15 minutes of charging. The filing shows the FCC used three separate chargers on the device, a standard charger, a Turbo Charger and an unknown charger with model number SPN5886A, which could be a new Turbo Charger that could possibly charge even faster than the current model.

Finally, the filing also mentioned a microSD slot, which could be one of the more exciting pieces of information for people who miss the days when they could easily expand the storage space on their devices simply by inserting a microSD card.

Motorola is known for being extremely mum about whatever it is working on, so not much else is known about this upcoming device. However, it is believed that this new smartphone could also be the same one that showed up as XT1585 at the GFXBench benchmarking site. Codenamed Kinzie, the smartphone is said to run on a Snapdragon 810 processor from Qualcomm, an Adreno 430 graphics card and 3GB of RAM.

Like the device that just passed through the FCC, Kinzie sports a 5.5-inch Quad HD display, raising the possibility that both smartphones are one and the same. GFXBench also says Kinzie will have 21GB of storage, which could really mean 32GB, a 20-megapixel rear camera, a 5-megapixel front camera and Android 5.1.1 Lollipop.

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