Matters needing attention: 1. Turn on flashlight to discharge, then charge for 4 hours before starting car. 2. Do not discharge and charge at the same time. 3. Charge every 3 months. 4. Charge phone tablet only occasionally. 5. Fast charge speed during last 15% power. START CAR BATTERY - Powerful And Safe, provides peak current of 4500A. PORTABLE POWER - Dual USB output/input, can charge smartphones and other USB devices. LED FLASHLIGHT DESIGN - Built-in LED light with 400 lumens, 4 modes: lighting, strobe, warning and SOS.