99nBattery LifeThe number of shots or movie footage that can be recorded withfully-charged batteries varies with the condition of the battery,temperature, the interval between shots, and the length of timemenus are displayed. Sample figures for EN-EL21 (1485 mAh)batteries are given below.• Still images: Approximately 310 shots• Movies: Approximately 65 minutes of HD footage at 1080/60iMeasured according to CIPA standards at 23 ±3 °C (73.4 ±5.4 °F)with the camera at default settings, a fully-charged battery, a1 NIKKOR VR 10–30mm f/3.5–5.6 lens, and a 16 GB ToshibaSD-E016GUX UHS-I SDHC card. Value for still images obtainedunder the following test conditions: photographs taken atintervals of 30 s with the built-in flash fired with every othershot and the camera turned off and then on after every tenshots. Value for movies obtained under the following test con-ditions: a series of 20 minute movies with a file size of up to4 GB were recorded; recording was only interrupted when tem-perature warning was displayed.The following can reduce battery life:• Keeping the shutter-release button pressed halfway• Repeated autofocus operations• Taking NEF (RAW) photographs• Slow shutter speeds• Using a wireless mobile adapter or Eye-Fi cards• Using vibration reduction mode with VR lenses• Using zoom with power zoom lensesTo ensure that you get the most from rechargeable NikonEN-EL21 batteries:• Keep the battery contacts clean. Soiled contacts can reducebattery performance.• Use batteries immediately after charging. Batteries will losetheir charge if left unused.