5000mAH of runtime capactity. Go compare the power capacity of other battery backs. You wont find better value. This portable power pack is great for business trips or when you're away from a charger. It can provide charge to your iPhone/iPod/iPad or any other device which can take power from a USB port....uhm like... Digital cameras, smartphones, GPS, MP3, computer tablets, e-books and so on. Boost the charge of your device's on board battery (it transfers power from the battery to your device) or simply run your device directly (this may depend on how your device is configured). Equiped with over charge and short circuit protection, you can be assured that your devices are safe when connected to this charge station.