HTC One is on display at a store. (Reuters)Reuters

With just a few days to go for the official launch of HTC 10 (aka One M10), the company has released a new video clip to tease a yet another key feature of the device.

In the 33-second clip, HTC said the company's engineers have worked tirelessly for "crazy long hours" to extend the phone's battery life and the fans will witness the new innovation at the smartphone unveiling event April 12.

"Our engineers are so obsessed w/battery life we've turned it into a science. You'll feel it. 4/12," HTC said on Twitter.

HTC 10: What we know so far

So far, the company has released more than five teasers of HTC 10 revealing that it will come with chamfered metal frame around the edges, two back-lit capacitive buttons with physical home button (with fingerprint sensor), dual-lens camera, advanced BoomSound stereo-based audio technology.

It is also said to sport a 5.2-inch super LCD 5-based QHD (2560x1440p) screen, Android Marshmallow OS, Qualcomm Snapdragon 820 quad-core SoC (System-on-Chip), 4GB RAM, 64GB/128GB inbuilt storage with option for expansion via micro SD card and a 3000mAh battery.

The HTC 10 is rumoured to house 12MP Sony IMX377 camera featuring 1.55mm lens, laser autofocus and PDAF (Phase Detection Auto Focus) and Samsung's 5MP UltraPixel (s5k4e6) snapper on the front.

Stay tuned for more updates.