High Power Capacity: Includes Tenavolts AAA High-Capacity Rechargeable Batteries pre-charged, each with 1110 mWh. Great use for high-power demand device, including insulin pump, toys, remote controls, and portable audio players 1.8 Hours to Fully Charged: Get a full charge in 1.8 hours. Much faster than traditional Ni-MH rechargeable batteries which need 3 hours to fully charged Constant voltage and Best Performance: Tenavolts rechargeable lithium batteries are far superior in voltage retention. Designed with innovative technology, Tenavolts outputs 1.5 voltage from 100% to 0% electric capacity, providing constant voltage and best performance in heavy load discharge Long-lasting batteries, Less Waste: Tenavolts can be recharged in 1,000 cycles.