Pack power with purpose. Coast Zithion - rechargeable lithium batteries change the game in responsible, portable power technology. Advanced engineering provides a comprehensive upgrade compared with other sources of battery power - delivering long-lasting run times for a clear performance advantage over standard rechargeable lithium and NiMH batteries. To mimic the broad compatibility of alkaline batteries, proprietary Coast ZX optimized voltage allows Zithion-X batteries to modulate their power supply up or down based on the need and prevent flickering, overheating, and damage to products. The leak-resistant battery casing prevents corrosion during use - matching performance with protection. Connect conveniently via USB-C to recharge quickly - in 2.5 hours or less for AA and 1.25 hours or less for AAA and forget about special charging cables and cradles. Every Zithion-X can be recharged at least 1000 times, resulting in significant cost-savings compared with single-use disposable batteries while keeping hundreds of batteries out of the landfill.