This 2 pack of DEWALT 12V MAX* 3Ah lithium ion batteries provide additional run time for DEWALT 12V MAX* tools, with 50% more capacity than the DCB122 2Ah battery (sold separately). These batteries include a fuel gauge LED charge indicator, making it easy to check that your battery is ready for the job. These batteries are compatible with all DEWALT 12V MAX* tools (all sold separately).