One 20-Volt max 6.0Ah battery and one 20-Volt max 4.0Ah battery provide up to 10 Amp hours of capacity Charges DEWALT 12-Volt to 20-Volt max lithium-ion batteries No memory and virtually no self-discharge for maximum productivity and less downtime Batteries come with a 3 year free service warranty 3-LED fuel gauge system for immediate feedback on the state of charge Charge your DEWALT 12V MAX, DEWALT 20V MAX, and FLEXVOLT batteries with this 4 Amp charger. This charger has a two-stage LED state of charge indicator to display when it is fully charged to keep you productive on the job and as well as mounting capability for a two screw wall mount (screws sold separately).Power your 20V MAX tools with this 20V MAX 6Ah battery and 4Ah battery that features the runtime and performance needed for tough jobs.