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My phone says charging and gives me a percentage, but when i checked it 20 minutes later my charge had gone down instead of up.
Perhaps there are a couple of things to try or to take into consideration before deciding that your Qi charger isn't working properly:
1. Is the phone in a case when you are placing it on the charging pad? This technology only works at a very short distance (we're talking millimeters here) so if the bare phone back is not directly on the charging pad there will be a reduction in charging capability.
2. Is the phone centered on the charging pad? There should be a mark or something to indicate the ideal placement of the phone; if it's not in the ideal location there will be a reduction in charging capability.
3. By its very nature, induction charging is not as efficient as a direct connection - so, if it used to take two hours to fully charge your phone, induction charging will take longer. How much longer depends on several factors including the two previously mentioned, along with the quality of the charging back and charging pad. I'm not an expert in this area, nor have I researched current data, but assume anywhere from 20 to 30 percent longer. (If you need hard data rather than a guesstimate I'm sure a Google search will turn something up.)
4. Try turning the phone completely off and time how long it takes to fully charge - this will act as your baseline (it'll never charge faster than this).
5. Try booting into Safe mode
http://support.verizonwireless.com/support/devices/knowledge_base.html/59242 and time how long it takes - there are no 3rd party applications running to chew up power.
6. Put the phone in Airplane mode and time how long it takes - this will be your next fastest time since the cellular radio, Mobile data radio and Wi-Fi radio are turned off (although you can turn Wi-Fi back on if you need some kind of network connection).
Note that the previous suggestions assume that you're starting charging at the same discharge amount and all other factors are the same.
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