For a limited time, you can pick up Kmashi's pocket-sized 5000mAh power bank for just $6 with coupon code S6Y8AMQO, a savings of $5. Being 5000mAh you'll be able to charge just about any phone or tablet that you are carrying around fully from the pack while out and about without needing to strap yourself to a wall. It outputs at a maximum of 5V/2A so it will deliver a quicker charge to your phone, and the bank itself recharges fully in around three hours.
If you find yourself running low on battery during the day, you should grab one of these for your pocket, purse, desk, bag, or anywhere else you can think to store one. Remember, you need coupon code S6Y8AMQO for the discount here.