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ONLY BY SPECIFIED RECHARGEABLEBATTERY 1)Do not use spoiled or useless batteryor charger 2)Do not throw the battery into the fire or otherwise it to heat; 3)Do not use it for other purposes; 4) When loading the battery ,make sure it is orientedcorrectly; 5) Never run out of battery power when you are about to score the winning point 6)The battery can be charged or discharged severalhundred times,lt should be replaced by new batterywhen it can not work as usual; 7)The charging time of the battery may be decided upon its remaining energy as well as the type of battery or charger that is used;