Tom America INC Portable MP4 is fantastic as a short road trip battery. It's bigger than I want to carry when flying but is perfect for charging. Right now Tom America INC has their Tom America INC Portable MP4 Player MP3 Player Video Player with Photo Viewer , E-Book Reader , Voice Recorder + 16 GB Micro SD Card (Black) for cheap price. You'll just need to visit the site.
Note: 16 GB Micro SD card included. But when you use this MP4, you can exchange the card randomly. Supports playback of MP3 and video in AMV format Memory ( External): up to 16 GB Micro SD card (included) Easy handling with "Plug and Play" Charging time about 3-4 hours while MP4 is in the status of "ON" Built-in Li-ion battery, charged via USB cable to the PC or wall socket adapter Image Viewing: JPG, GIF, BMP Dictation E-book function (txt compatible) - Play Modes: Normal, Folder, Repeat, Replay - Languages: German, English, French, Italian, Dutch, Portuguese, Spanish, Swedish, Chinese. Package Contents: 1 x MP3 / MP4 Player 1 x 16 GB Micro SD card 1 x Data Cable 1 x Earphone 1 x English User Manual