While Gionee didn't provide too many details about the M5, we can now take a look at it thanks to China's Telecommunication Equipment Certification Center, which is also listing most of the handset's features.
Running Android 5.1 Lollipop, the Gionee M5 is a mid-range smartphone with a 5.5-inch 720p AMOLED display, a quad-core 1.3 GHz processor, 2 GB of RAM, and 16 GB of expandable storage space. The handset also has a 5 MP front-facing camera, and an 8 MP rear camera with LED flash. It measures 152 x 76 x 8.6 mm, and is pretty hefty, weighing 213 grams - but that's understandable, as two batteries can't be lightweight. Speaking of which, we still don't know the batteries' capacities.
While the M5 is the first Lollipop handset to include two batteries, it's not the world's first smartphone to achieve this. For example, the Innos D6000 (announced at MWC 2015) also has a couple of batteries inside, but this one runs Android KitKat.
The Gionee M5 is certainly an interesting device. We'll let you know more about it when Gionee officially announces the new smartphone - which should happen soon.