Big Problems With Little Mophie Battery Pack?

After my post yearning for more battery life out of my iPhone 3GS and hoping that the Mophie Juice Pack Air might hold the solutions to all of problems, a reader, who shall remain anonymous, tipped me off to some unresolved problems with the current generation fo the combination iPhone case/battery pack.

At left is one of two screenshots he sent me purporting to show the Juice Pack Air refusing to provide power to his iPhone (which kind of defeats its purpose). He bought one, was told it was defective, was given a replacement, and found it had the same troubles.

Here’s his explanation:

“It only happens if you discharge your iPhone to 20% warning. Then allow the Mophie to charge your iPhone 3GS until its depleted. Once it’s at zero charge the errors happen in the iPhone 3GS every time. I think those errors even crashed the phone once, but this is unconfirmed but feel its right since it was left to charge, placed in an outer mesh pocket of a laptop bag and found unresponsive later until removed from the Mophie and hard reset. Sigh.”

Anyone else seen these issues? I’ll admit, it has me back in a wait-and-see mode again…