Pale Blue Earth Lithium Ion Rechargeable C Batteries 2 Pack. Just plug any micro or type C USB cable or use the included cable to charge two batteries at once. Built-In LED Charging Indicator. Pale Blue Batteries let you know when they are fully charged. On-Board Smart Technology Provides Safe Charging. No more batteries ruining expensive electronic devices Specifications for Pale Blue Earth Lithium Ion Rechargeable C Batteries: Manufacturer: Pale Blue Earth Color: Black Battery Quantity: 2 Battery Capacity: 5000 Battery Type: Lithium Ion Voltage: 1.5 volts Features: Chemistry: Lithium Ion Power W-h: 7.5 Watt hours Charge Time: Under 5 hours (depending on charger specifications) Cycle Rating: 1000+ Cycles Charging Cable: 1 USB to 2 Micro USB Charge State Indicator: Red 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 Rage: -20c -> 60c (-4F-> 140F) Self-Discharge: The dormant / self discharge characteristics of Pale Blue batteries are very low. This is one of the advantages of a lithium ion battery with a control circuit vs an alkaline or NiMh battery where the cell discharges directly into the circuit (no control circuit). The battery life in dormant mode depends partly on the environment. High ambient temperatures and higher humidity increases the internal drain. But in normal circumstances a battery installed in a device like a door lock will last 12 months. Cells Per Battery: 3 Lithium Content: 0.54g Individual Battery Weight: 74g Package Contents: Pale Blue Earth Lithium Ion Rechargeable C Batteries 1 Charging Cable Pale Blue Earth PB-C: Lithium Ion Rechargeable C Batteries 2 Pack Pale Blue Earth PB-C: Lithium Ion Rechargeable C Batteries 2 Pack