Instapark MP3450E-60 27,000 mAh Dual External Battery Pack & Universal Charger USB Port for Dell, IB

• High-capacity 27,000 mAh Li-ion rechargeable & portable battery pack
• Simultaneously charges two devices: one 5V USB and the other voltage selectable 8.4V / 12V / 16V / 19V
• Compatible with virtually all laptop computers, netbooks, USB compatible cell phones, tablet computers, MP3 Players, digital cameras, handheld game consoles & etc.
• 4-LED battery level indicator & automatic switch on when a device is connected
• Includes detachable 14,000 mAh battery pack doubles charging capacity

I also purchased a 10 watt solar panel from Instapark. Hiking in the mountains and camping the battery provided recharging for a tablet and cell phone. While gone during the day the 10 watt panel helped to recharge the battery for the evening recharging while perched on the tent. Beware that the model I bought does not include a charger with the battery. In the product info this was not to be found. However you are provided a few adapter tips to retask your laptop supply to quickly recharge the unit.

In the field with no power available except solar I was able to run for 5 days before the solar panel couldn't keep up enough of a charge and I had to seek an outlet. Next time I may attempt to use an array of three 10 watt foldable panels to keep things running, keeping each at a different angle to optimize the sun's changing position while I am away from basecamp.

Buy Instapark MP3450E-60 27,000 mAh Dual External Battery Pack & Universal Charger USB Port for Dell, IB Now

The output tips are all tiny and L shaped. If your device's power isn't easily accessible, these will not fit. It's a major design flaw and it forced me to return the product. I'd recommend just getting two Astro3's instead.

The USB port is output only. You can only charge the device through the DC in. You must also supply your own charger.