Never leave your cordless impact driver outside. Always store it indoors in a clean, dry area, free from moisture and dust. Most cordless impact drivers come with storage case to house the tool as well as accessories such as the charger and any spare battery packs.
Never attempt to use the tool if you suspect it is damaged or broken.
Always keep safe any instruction manuals or user information that may have come with the tool. If you do encounter a problem with the cordless impact driver, you may find a solution in the manual, or some useful contact information for someone who can help.