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RIDGID introduces its new 4.0 Ah Hyper Lithium-Ion Battery. With their new and improved chemistry these 4.0 Ah batteries get up to 4 times the run time of standard lithium-ion batteries. All Hyper Lithium-Ion batteries are built for high performance. They're protected from overheating, overloading and overcharging through their triple protection electronics design. Their chemistry allows for maximum performance in temperatures as low as -4° and up to 120°F.