M18, 18 v, lithium-ion, high output, 12.0ah battery pack, red link intelligence provides optimized performance & overload protection using total system communication between tool, battery & charger, best in class construction offers long lasting performance & the best protection against jobsite, weather & environmental conditions, fuel gauge onboard displays remaining run time, versatility powers all 150 plus m18 cordless solutions, compatible with all m18 tools.