The pending charges are Turbine's test to verify that the card is good. That money will be released in a few days. Many people encounter this issue when buying fuel at a gas station. On insertion the station will apply a 50 or 100 hold on the card. You buy 20 dollars worth of fuel. It may take several days to get access to the unused 30 or 80 dollars. This situation can be a real problem for a card with only few dollars behind it.
Another issue with the test charges is when you keep trying to apply the card. Your bank will see multiple charges. In some cases, a fraud lock out on the card will be applied.
Unless stated otherwise, all content in this post is My Personal Opinion.