I purchased 2 batteries 18 volt ryobi having a number of tools of this type at first I had issues changing the batteries however worst was to happen on using my ryobi sander with one of the batteries purchased from this company it suddenly began to omit large and sudden quantities of smoke I quickly removed the battery and threw it down my drive,where it continued to smoke for a couple of minutes,spend the extra and get the official product do not risk harm or a fire with products supplied by this company