XPAL Power PowerSkin Protective Case with Built-in Battery for Samsung Galaxy SII...
Life charges on...With twice the power for your smartphone, your life charges on. You can keep working. Keep playing. Keep moving.
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As low as $35.75
User Review: Allows me to complete a round of golf with GPS program and still have 50-60% battery power left to use during the rest of the day. Without - 15-20% at best.