ReVIVE’s Solar ReStore XL USB Battery Pack is currently being offered at just $39.99 shipped, originally priced at $109.99. It stores emergency power for weeks without degradation, so you’ll have the power when you need it. Product page. Continue reading for a video preview.

Notable features:

  • External battery pack recharges up to 1,000 times from Solar or USB power.
  • Solar Charging Time: 13 hours in direct sunlight – high-efficiency 300mA ; USB CHARGING TIME: 4 – 6 hours.
  • 4000mAh battery is ideal for giving mulitple charges to virtually all smartphones and most MP3 players and E-readers.

[via Amazon]