Mother's Day is just around the corner and Mophie has just released a new limited edition purple colored Juice Pack Plus battery case for the iPhone 4. If you haven't already checked out our review of Mophie's Juice Pack Plus, you can catch it right here. Why not gift your lovely mother the gift of more power? The Juice Pack Plus will single handedly double your iPhone 4's battery life and then some with its built-in 2000mAh battery. Did I mention it's also shock protective? You can grab a limited edition purpled-out Juice Pack Air now for $89.95 until May 8.