Today only. Best Buy has a Mophie 10,400mAh Portable Charger Sale $19.99. Free Shipping. Highly rated at 4.7 out of 5. White.  $80 at amazon.

My battery never lasts long enough. Get more battery life out of your smartphone and other devices.

• 4-LED charge status indicator
• Provides up to 8 complete battery charging cycles!
• Always have a backup power source to recharge your device with this 10,400 mAh mophie powerstation Boost XL power bank. Its 2.1-amp USB port lets you charge a compatible smartphone, tablet or Bluetooth speaker. Recharge this white mophie powerstation Boost XL power bank with the included microUSB cable and a USB charger.