DEJI Batteries Can Be Used In Very Low Temperature

   Compared to the older battery, Lithium-ion battery have some huge advantages: they make it easy to charge your phone fast, which is why you can go from 20 percent to 80 percent charge in less than half an hour.
However, for people living in or traveling to the extremely cold area, they have a headache: why the phone goes dead when it gets too chilly in winter?
Part of the reason has to do with the internal resistance in the battery, which is a measure of how much of the battery’s power is “wasted”: essentially, how much of the battery's charge is dissipated internally rather than working to power your phone. When the temperature drops, the internal resistance of your battery goes up. That means more of your battery's power is wasted – so your battery has to work harder just to keep your phone running. So you'll see the charge go down much faster than if you stayed inside.

  What’s more, Li-ion batteries continually carry out a chemical reactions to generate energy. However, it can’t carry out that chemical reaction as quickly when the temperature goes down. Therefore, it can’t generate as much power for your phone. As a result, it won’t generate enough power for your phone to carry out its basic functions, which led to your phone suddenly shut off, even if it says you still have battery life left.
To solve these problems, DEJI factory manufactured batteries with original TI IC and pcb board is designed by our boss Jackie and his excellent engineer team. What’s more, all batteries have passed over-charged, over-discharged, over-current, over-temperature and short-circuit protective function. Therefore, DEJI batteries can used in extremely low temperature regions such as Russia, Ukraine, Denmark, Iceland, Finland, Canada and so on. We have many customers in these areas and prove it.
In addition, there are some tips for you to keep your phone running and protect your battery from dead in the cold. First, the most obvious, simply shut off your phone when you’re out in arctic temperatures. But it may not be convenient; Second, keep it in an internal pocket in your coat, so you’ll keep it toasty with your body heat; Third, if you spend a lot of time outdoors and need a functional phone (say, for safety when skiing or winter hiking) invest in an insulating case to keep the heat in and the cold out. Last, most importantly, keep your phone on you and never leave it in a parked car outside where it’ll be exposed to sub-zero temperatures for hours. 
Below video is the aging test equipment of our DEJI factory for your reference. The testing temperature is 120℃.