["Description:\r\n\r\nFeatures:\r\nbrand new and high quality.\r\nThis battery box holder fits for 3pcs or 4pcs flat 18650 batteries(Optional)\r\nParallel connection, safe and easy to use.\r\nOutput voltage for DC 3.7V.\r\nSimple DIY recharge power supply.\r\nYou could use this for case with your own battery to form power supply system. \r\n \r\nKindly remind:\r\n18650 batteries are not included in the package, you need to purchase separately.\r\nCan only use the 18650 battery of which positive pole is flat top.\r\n\r\nSpecifications:\r\nItem Type: 4x 18650 Parallel Battery Holder Box \r\nMaterial: Plastic + Metal\r\nColor: Black\r\n3 slots Size: 7.8×6×2cm\r\n4 slots Size: 7.8×7.8×2cm\r\nCable length: 10cm/3.94in (Approx.)\r\nDesign: Parallel Connection\r\nType: 3 slots,4 slots(Optional)\r\nFit for: 3x or 4x 18650 3.7V battery (Not Included)\r\nOutput: for DC 3.7V\r\nRed positive, black negative.\r\nQuantity: 1 PC (other accessories demo in the picture is not included)\r\n\r\nNote: \r\n1.Transition: 1cm=10mm=0.39inch\r\n2.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.\r\n3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!\r\n4.No retail package\r\n\r\nPackage includes:\r\n1 X Battery Box Holder (Batteries are not included.)"]