The jump start mode will initiate a charge sequence, collecting energy from the battery. Once the ultracapacitor is charged, it will assist the low batteries to provide the power the crank the engine. The 12V Ioxus UltraCapacitor is designed to work with at least one 12V battery connected in parallel, and the unit needs at least 6V to be able to turn on. Often, when installing the UltraCapacitor, one or more batteries can be removed. Features: Increased Reliability - prevents stranded vehicles, starts in the harshest of conditions Made in the USA Increased Efficiency - powers hundreds of Stop/Start events per day, ideal for delivery vehicles Rapid Payback - Keeps your trucks rolling Battery life doubled Starter life doubled Built-in, no service call, "Jump Start" - even with a dead battery 10 Minute Installation- direct battery replacement (2 Wire) - No Rewiring! ELECTRICAL SPECIFICATIONS: Cold Cranking Amps [Nom]: 1100 Voltage (Rated/Surge) [VR/VS]: 7-14.5 / 80 Reverse Polarit Protection (V): -30 DC ESR 10ms (mOhm) [Nom/Max]: 3.5 / 5.5 Initial Charging Time (min) [Nom/Max]: 9 / 25 Recommended Engine Size (Liters):