Pack power with purpose. COAST ZITHION-X rechargeable lithium batteries change the game in responsible, portable power technology. Advanced engineering provides a comprehensive upgrade compared with other sources of battery powerdelivering 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 usematching performance with protection. Connect conveniently via USB-C to recharge quicklyin 2.5 hours or less for AA and 1.25 hours or less for AAAand 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.