Logitec LDT-1Si41Logitec Japan (not to be confused with Logitech) recently announced the launch of the LDT-1Si41. The LDT-1Si41 is a battery pack for the iPhone 4 that does more than provide juice in times of need. It comes with an inbuilt retractable antenna that will allow users to watch terrestrial TV on their iPhones. Using the provided app, folks can also record TV on their iPhones just in case they’re too busy to watch something at the moment.

The LDT-1Si41 has a 1500mAh battery which should double the life of the phone (the iPhone 4 comes with a 1420mAh battery). It will be available in Japan next month, for 12,800 Yen ($164). The app will be available as a free download from the Apple App Store. Find out more.

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