Welcome to visiting our site. We have superior Lithium batteries selling and service. There is no doubt that they are high quality and durable as well as high energy density. Also， these batteries are regarded better both in low and high temperature operations. Generally， they fit for camera， watch， calculators and other electronic devices， and provide excellent continuous power sources to your device. It is worth a try!                                    Features                High quality and durable<br>    Provides excellent continuous power sources to your device<br>    High energy density， long life battery<br>    It is good both in low and high temperature perations<br>    Fit for camera， watch， calcutors and other electronic devices<br>                                                            Specifications                        Brand     UltraFire    <br>          Type     18650    <br>          Marking Capacity     4000mAh    <br>          Actual Capacity     1400 - 1600MAH    <br>          Voltage     3.6 - 4.2v    <br>          Chargering Time     6Hours    <br>          Dimensions     6.4 x 1.8cm / 2.52" x 0.71" (L x Dia.)    <br>          Rechargeable     Yes    <br>          Color     Black    <br>          Weight     2.93 oz / 83 g    <br>          Battery Type     Lithium battery    <br>                                                             Package Includes                2 x UltraFire 18650 4000mAh 3.6 - 4.2V Flat Head Lithium Batteries Black<br>