ChangeWave survey: Demand for Kindle Fire slipping by Philip Elmer-DeWitt @FortuneMagazine February 2, 2012, 11:17 AM EST E-mail Tweet Facebook Google Plus Linkedin Share icons Chief complaints: lack of volume control or camera and that the battery life’s too short Click to enlarge. Source: 451 Research They liked the price, the color screen and the selection of books on Amazon AMZN . They wish it had a volume control button and a camera and that the battery lasted longer. Those are some of the results of a survey of 254 Kindle Fire owners conducted in January by ChangeWave Reserach, a service of 451 Research. 54% said they were very satisfied with their new tablet, which is better than the 39% “other tablet devices” got in a November survey, but considerably less than the 74% of Apple AAPL iPad owners who said they were very satisfied. Moreover, the percentage of early adopter types who told ChangeWave they were “very likely” to buy a Kindle Fire fell from 4% in December, when the initial excitement was at its peak, to 2% in January. The number who were “somewhat likely” to buy one fell from 13% to 10%. But the finding ChangeWave found most interesting — and which they highlighted in a release to the public Thursday morning — was that nearly three-in-ten consumers who own a Kindle Fire (29%) said they will spend more money at Amazon over the next 90 days, compared with 19% of non-owners. Given that Amazon is selling the Kindle Fire at a loss, that may be the result that matters most to CEO Jeff Bezos. For more on the ChangeWave findings, click here. Below the fold: More charts from the January survey.