newegg.com offers the Energizer Protective Case with Built-in Battery for Apple iPhone 3G / 3GS, model no. AP1500, together with an XGear Blade Tornado Case for Apple iPhone 3G / 3GS in Black, model no. IP3-BLADE-BLK (add the Energizer case to your cart and the XGear case appears automatically) for $14.99. With free shipping, that’s tied with our July mention of the Energizer case alone and $20 under the lowest total price we could find for these two cases purchased separately elsewhere. It’s also still the least expensive iPhone case we’ve seen with a built-in extra battery.
The Energizer protective case features a built-in battery and has an LED battery life indicator light. It comes with a USB charging cable and provides up to four extra hours of talk time. The XGear case features ABS construction, impact resistance, and more.
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