Milwaukee REDLITHIUM batteries are the next generation in Lithium-Ion technology. Compatible with all products in the M12 Cordless tool system, REDLITHIUM battery packs will provide unmatched runtime, performance and durability for the professional tradesman. 1.5 Amp hour - 16 Watt hours battery. Lightweight - Over 65% lighter vs. compact NiCd Batteries. Compact - Over 50% smaller vs. compact NiCd Batteries. LITHIUM-ION battery delivers long life and run time with fade-free power. For use with Milwaukee M12 cordless tools. Fuel gauge onboard: Displays remaining runtime3-Year Limited WarrantyDelivers long life and run time with fade-free powerREDLINK intelligence: provides optimized performance and overload protection using total system communication between tool, battery and chargerLithium-ion battery is smaller and lighter than NiCad batteriesFuel gauge onboard: displays remaining runtime for less downtime on the jobAll-weather performance: delivers fade-free power in extreme jobsite conditionsBest-in-class construction: offers long-lasting performance and durabilityCompatible with all M12 chargersM12 compatibility compatible with most M12 tools and electronics (not compatible with 2320 M12 plumb laser and 2290 sub-scanner M12 cordless detection tool)