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I was trying to see if I could charge the Ryobi P102 Lithium battery without the original charger (a working battery). According to some videos I have viewed, all one needs to do is attach charging current, 20 or so Volt to the + and - terminals of the battery. I let the battery drain to 18V. Then I connected 19.2V from a laptop power supply, positive to battery marked + and negative to battery marked -. But it did not work. So, I searched a little further. The battery post has 3 terminals. 1 on the side marked with + , one on the other side marked -. The third one in front (or you can call it behind) is not marked. Commonsense would say that the charger should have current between the corresponding +/- terminals. NOT SO. In the charger, I connect the probes of the meter to the two side terminals. It shows no current. But if I touch the one in the front to one of the two on the side, I get 3 volt, the front one being positive. So front-left is 3V and front-right is 3V. And this thing charges an 18V battery. Can any one please explain the above. And how would 3V charge a battery to 20V or so? Any one knows a way of charging this battery without owning the charger and without having to open the battery to charge it. Thanks.