No, that is actually a Nickel Metal Hydride (NiMH) battery. It has 6 cells (AA Size, like a small flashlight or remote takes) and each cell is 1.2 volts giving the pack 7.2 volts.
Change your battery settings on your charger to NiMH and it should charge just fine. The settings on the charger stock should be fine. Don't worry about any of them other than the amperage. speaking of that, I would charge at 1 amp if it were mine. Get a light bulb like you have in your brake lights, and run that battery down until the light just starts to go out, but doesn't completely. The bulb will draw about 2 amps, so it's a 1c discharge rate. If you want, you can put another bulb on there in parallel and raise the amp draw.
Once it's almost completely discharged, as long as the cells are not HOT, only warm, stick it immediately onto the charger. Let it charge all the way on the NiMH setting and you should get a good battery. Don't worry about the voltage going up, then coming back down, this is what is called "Delta Peak Detection". When these are fully charged, they will actually drop voltage just a bit. Your charger will kick it off when it drops a specific amount.
Also, make another plug where you can plug this thing directly into the main port. That may have a balance port on it, but it's not for balancing. The reason cell 1 is so low is because there is not a wire in there. Meaning there is a slight draw on that channel, but it's not much.
Hope this helps.
