Mophie ( is offering new color availability for the $79.95 juice pack air for the iPhone 4 and the $59.95 workbook protective case for the iPad.

The workbook, which launched in late October in black, white and orange, now also comes in two new color combinations: chocolate with cyan strap and cement with yellow strap. Glossy white and soft-touch red colors join the line of juice pack air for iPhone 4 external rechargeable battery cases, which have previously only been available in soft-touch black.