Macmall.com’s Deal of the Day is the Mophie Juice Pack Air rechargeable iPhone battery case (model no. JPA-IP3G-BLK) priced at $64.99, which is $15 off its list price of $79.99 and the best cost we have seen for this case/charger combo by about $10. Shipping rates start at $3.99 and sales tax applies for residents of California, Tennessee, and Wisconsin.

Amazon.com this week is offering two alternatives to the Mophie Juice Pack, one being the Kensington Charging Dock with Mini Battery Pack, and the other is the Konnet Technology iPhone Case with built-in battery. The Kensington Dock and Mini Battery are priced at $49.18 with FREE shipping included, while the Konnet case has dropped to $68.51 and also includes FREE shipping. When you don’t need to charge or extend the time of your iPhone switch to the stylish Griffin Wave Case at Thenerds.net. It’s currently priced at $17.99 and has shipping rates starting at $9.99. Lastly, pick up an extra pair of headphones by heading to Buy.com for the Sony MDR-EX56 Stereo Earphones. Once priced at $39.99, the earphones are now on sale for $18.99 with FREE shipping included.

The Mophie Juice Pack Air is designed as both a protective case for the iPhone 3G and an external battery. It provides up to 4.5 hours of extra talk time, 6 hours of video playback, or 20 hours of audio playback per a single charge. It includes an integrated LED battery status indicator that displays how much life is left in the battery, as well as an on/off switch to conserve power. The device charges using a USB cable and is capable of charging both itself and the iPhone simultaneously. Lastly, it comes backed by a one year warranty for both parts and labor through Mophie.