product: Third Rail System for iPhone 4/4S
category: Smartphone Battery Case
description: The Third Rail System includes a slim case for the iPhone 4/4S and an optional modular battery, which can be purchased individually or as a set. The battery has a capacity of 1250 mAh  and is slid onto the back of the case in order to charge the iPhone, up to six batteries can be combined. In addition, the battery is capable of charging other devices, such as smartphones by other manufacturers, using the included micro-USB cable.
text: Product Name: Third Rail System for iPhone 4/4S;
  
  Product Category: Smartphone Battery Case;
  
  Product Description: The Third Rail System includes a slim case for the iPhone 4/4S and an optional modular battery, which can be purchased individually or as a set. The battery has a capacity of 1250 mAh  and is slid onto the back of the case in order to charge the iPhone, up to six batteries can be combined. In addition, the battery is capable of charging other devices, such as smartphones by other manufacturers, using the included micro-USB cable.