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Assuming you don't know the history of that used Lipo, the owner dumped it because it no longer works for him.
Your Hitec charger is a smart charger, and chances the previous owner used a basic dumb charger which already damaged the cells.
If you are getting 3V, the battery are at the lowest point before recovery. Also if the previous owner could have discharged them below 3V many times will result in a junk pack now.
Best to toss it instead of risking burning down your house or gun.
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