AA USB-C Rechargeable Batteries from Pale Blue. Designed to outperform alkaline batteries Fast charging with a USB-C port on each battery Easy to use included charging cable can charge 4 batteries at once Each Paleblue battery can prevent up to 1,000 single use batteries from being thrown away Package includes 4 Paleblue AA Batteries  1 Charging Cable (USB-C) Technical features Chemistry Lithium Ion Power 2550 mWh Voltage 1.5V Capacity 1700 mAh Charge Time 90 Minutes (depending on charger specifications) Cycle Rating 1000+ Cycles Charging Cable 1 USB-A to 4 USB-C Charge State Indicator Green LED Protection Circuit Integrated safety circuit protects battery and device Overheat Protection Operating at max output the battery will not overheat, this is part of the protection circuit Other Safety Protections Protects against Overload, Leakage, Short Circuit, Over Voltage, & High Temperature Certifications IEC 62133, CE, FCC, PSE, UN38.3, RoHS, REACH Operating Temperature Range -20c -> 60c,