eMate Replacement Power Adapter/Battery

So I managed to get the eMate leads soldered onto the pack from the baby monitor, and plugged in to the eMate. It sees that there is a battery there, and says that it is charging/charged but when I pull the power adapter out it goes dead right away. Not sure if pack or operator error lol! Any idea why it would say that? It's a 7.5V charger. I get a solid orange then solid green on the eMate, but then it's like nothing is there.
 
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