Need to charge more than just your mobile phone? Invest in greater, more versatile power with the Anker Astro Pro2. A beast of a battery. When a standard external battery just won"t cut it, reach for the Astro Pro2. Packed with 20000mAh of capacity, this is one portable power pack that"s able to charge most phones 9 times, tablets more than once or a laptop one time. Hugely versatile. Choose from between DC 12V / 4A, 16V / 3.5A, 19V / 3A and USB 5V / 2.1A outputs for greater accessibility. The three voltage selections enable this external battery to charge laptops (that meet compatibility requirements) - in addition to virtually all USB-charged devices. Laptop compatibility requirements (both must be met), Please check to ensure compatibility before purchasing: 1) Voltage input: 11.5-12.5V, 15.5-16.5V or 18.5-19V. 2) A laptop connector that fits your device"s power input port (see below). Included laptop connector tip sizes (outer x inner diameter in mm): A - 6.00×4.25 - Sony VAIO B - 6.25×3.00 - Toshiba Satellite A105, M35 C - 5.50×2.10 - Toshiba T1950, T4700 / Acer Aspire 1200 D - 4.75×1.70 - ASUS Eee 900, 1000 E - 5.50×1.70 - Acer Aspire One AO722 AO725 F - 5.50×2.50 - ACER Aspire 1600, 5610 G - 4.00×1.70 - HP Mini 1000/ 1100 Series H - 5.00×3.25 - Samsung N130, N310 J - 7.40×5.00 - HP Pavilion DV6 / HP G60, G61/ HP Compaq CQ60, CQ61 / HP 550 / Dell inspiron 1525, E1505 K - 7.90×5.40 - ThinkPad T60, X60, R60 Get to know us. The Anker® Astro external battery has been voted #1 in class by thousands of online reviewers, while our renowned customer service has made us a fan-favorite across the web. Every sale includes an 18-month, worry-free guarantee to prove the importance we set on quality. After all, we"re customers too.