Depending on the devices you got.
HULKMAN Alpha 85S and Alpha 100 are both equipped with Pre-Heat Technology, which can start your dead car batteries in freezing weather. Just feel free to hit the road this winter.
We recommend you choose Alpha 85S or Alpha 100 if you need to start your car in freezing weather.
Your jump starters are made of low-temperature resistant batteries, which can be stored and operated in a much lower temperature than other brands' jump starters.
With Alpha 85S or Alpha 100, if the jump starter detects that the temperature is below the lowest operating temperature, it will automatically operate the Pre-Heat Function to warm up and reach an ideal operating temperature.
HULKMAN 's Operating Temperature:
|HULKMAN||Alpha 85||Alpha 85S||Alpha 100|
If the screen shows 'Error Code 3', please follow these 3 steps: