In looking at the PS - it is unregulated and I seriously doubt it is properly protected from thermal overload or even fused. I know you think you got a good deal, and perhaps it would be fine if you stuck a fuse on it and ran some outdoor lights.
For your charger - you would be much better served converting an old PC power supply (as little as $5) to feed your charger.
Lots of links in these forums on how to do that. Takes only a couple of minutes.
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