It appears from your description that this is a 2 cell LiPo battery. If so, you do require a certain type of charger to charge them, i.e. a current limited/constant voltage type. LiPo's, if improperly charged or accidentally shorted out, can erupt in flames that are very difficult to extinguish as you would need to blanket them in some substance to prohibit an oxygen source such as air. Sand will work.
In general, you must charge these at a not greater than 1C (3.2 amperes for your 3200 mah battery) and a fully charged cell will be 4.2 volts (8.4v for two cells in series). If you discharge them much below 3 volts per cell, they will be permanently damaged.