Brand NEW OEM Kyocera Standard Battery 3080mah for Kyocera DuraXV E4520 DuraXA E4510 DuraXE E4710 IN-NON Retail Package This battery has never been used and is manufactured with expectations to last 500+ Charge cycles Keep a spare in your glove compartment or at your desk to ensure you always have juice get from 0% to 100% power in a matter of seconds by simply swapping batteries Please notice that use up all the power of battery for the first three times before charging, and then take a full charge, thus the battery can be reached the optimum effect of using Please remember that its full performance and longevity is only achieved after 3 to 5 complete charge and discharge cycles