Pale Blue D Size USB-C Rechargeable Batteries, 2 Pack. Lithium Ion rechargeable batteries with convenient USB-C charging port. Just plug in any USB-C cable or use the included cable to charge two batteries at once. Charge Time: Under 5 Hours, Voltage: 1.5V. Cycle Rating: 1000+ Cycles. Charging Cable: USB-A to USB-C or Micro USB. Build-in LED charging Indicator. On-Board smart technology provides safe charging no more batteries ruining expensive electronic devices.