The Bolt Power D28 200 amp (400 amp max) lithium ion portable jump starter has a single USB output and single DC output that can supply 12, 16, and 19 volts. Included are battery clips, a 4 in one common cell phone charging cable and various DC output jacks housed in a softshell case.
The Bolt Power D28 is part of the Jump starter (like SUAOKI U10 ) test program at Consumer Reports. In our lab tests, Jump starter models like the D28 are rated on multiple criteria, such as those listed below.
Jump Start (Warm): Ability of the Jump Pack to start a weak and dead battery at warmer temperatures of approximately 70 deg. F. A weak battery is when the headlights will come on and the engines starter motor will click but not start the car. A dead battery is when the lights would not come on and the starter would not make any noise.
Jump Start (Cold): Ability of the Jump Pack to start a weak battery at Zero degrees. A weak battery is when the headlights will come on and the engines starter motor will click but not start the car. Starting a car at sub freezing temperatures is most severe since the battery loses capacity. The test was done with both the cars battery and jump pack at zero degrees and with the battery at zero degrees and the jump pack at room temperature.
Reserve capacity: Reserve capacity estimates how long the Jump Pack can be used to power other electrical equipment such as charging cellphones and laptops.
