1.Ultra larger capacity: 1.5V 15,000mWh lithium d batteries have larger capacity and higher voltage than NIMH batteries, support stable power and longer working time for high power demand devices. 2.Constant 1.5V Output D cell rechargeable batteries 10000mah ,long lasting lithium batteries with no memory effect, steady 1.5v output voltage. 3.2 in 1 micro USB cable: Unique USB charging design, 2 Pack USB cable are convenient to charge anywhere directly with provided 2 in 1 micro USB cable, no need extra charger. 4.Fast Charging: Quick full charging is achieved in 3 hours with an additional 2-year standby time. 5.USB D cell batteries can be used in any household devices need D cell batteries, great for high-power demand device such as LED candle, flashlight, spotlight, gas water heater, baby monitors, toys and more.