Pros: Adding the flashlight and jump-start capability sets this rechargeable USB power pack a cut above the rest. Well Designed: - Balanced Charger - High Output Current - Alternator Feedback Protection Quality Construcion Battery Gauge Good Quality Storage Case Comprehensive Accessory package Reasonable Price

Cons: No Short-Circuit or Reverse Polarity Protection Slightly Annoying Flashlight Control (knit picky

Overall Review: I design equipment so I quite often open things up to see if I want to make changes before I even turn them on. I was very impressed with the design and quality of this device. My review is going to sound like a sales pitch but I have no affiliation with the company other than having purchased the item. The device is well thought out and built with good quality components. It comes in a sturdy carrying case with plenty of USB device adapters, AC charging adapter, cigarette lighter charging adapter, and the jump-start cables. The battery occupies a little over half of the interior and the electronics are on a circuit board right behind the side panel with the display ( a 5 LED battery gauge) and connectors (2 USB ports, the charging connector, and a covered connector for the jumper cables). The circuit board and component quality is very good. None of the big blobs of solder, jumper wires, and tacked on components you see in a lot of cheep products. A pretty circuit makes a good first impression but some testing is required for a good evaluation. Aside from the battery itself, the most important component of power storage device like this is the charging circuit. Lithium ion batteries do not tolerate over charging so anything with lithium ion cells in series needs to have a balanced charger or the battery life will be drastically reduced. This charger does in fact keep the cells equal to the accuracy of my equipment (+-0.001V). The vehicle jump-start capability is very good. There is no reverse polarity or short-circuit protection so you need to be careful not to short the jumper leads or reverse the connections. It does, however, have a diode in the positive lead wire to prevent a running vehicle from trying to charge the lithium battery. This protects both the battery from improper charging and the vehicle's charging system from damage trying to dump huge currents into the lithium battery. There are several prominent warnings to remove the device within 10 seconds of starting the vehicle. There is no such urgency if the diode is working but diodes almost always fail as a short-circuit so you wouldn't know if it was bad. The jump-start function would still work fine but with no vehicle charging system protection so it's best to be safe and disconnect right away. There are switching regulators for the USB ports and for the LED flashlight providing efficient conversion of the battery power to these features. The device has a single push button which activates the battery gauge and flashlight. Pressing the button turns on the LED gauge for 5-6 seconds. Holding the button for 2 seconds turns on the light which has 4 modes: Off, On, Blink, Coded Blink. All the modes make sense except for the Coded Blink which repeats OOO in Morse code. I assume it was supposed to be SOS and there is a minor software bug. The 2 seconds to activate the light is fine but I find it a bit annoying having to hold the button 2 seconds for every