Groupon has the myCharge Portable Power Bank 1000 or 1200 Battery for $12.99 (39.99 – 68% instant savings) and the myCharge Portable Power Bank 3,000 for $19.99 (79.99 – 75% instant savings) with Free Shipping for limited time. Deal expires July 14, 2013.

Smartphones and other devices can extend their battery life on the go with help from these specialized power banks. The myCharge Portable Power Bank 1000 has a 1000mAh battery capacity and features a built in micro USB conector for most Android smartphones. The myCharge Portable Power Bank 1200 has a 1200mAh battery capacity and features a built in 30-pin connector for Apple devices. The myCharge Portable Power Bank 3000 has a 3000mAh battery capacity and features a built in 30-pin, mini-USB and micro-USB connectors.