"Description:This is really the latest state of the art technology in rechargeable. It is extremely thin, lightweight, and super thin compared to any rechargeable chemistry. Low weight, small size but huge capacity. The other advantage of the technology is the very low self-discharge.Features:Excellent safety performanceLightweightHigh capabilityLow internal resistanceExcellent discharge performance1C Discharge RateLong cycle timeApplications: Electrical Toothbrush, MP4, MID, monitor, backup power, Portable , POS machine, Desk video, motor, drill, and Digital .Note :Red connect "+", Black connect "-"; the size has -3mm-1mm tolerance, In order not to damage the or shorten life, high voltage charging and incorrect connecting of the positive and negative pole is prohibited. Please make sure there is no wrong positive and negative connections between your charging device and the JST Head.This is not suitable for high rate discharge UAV applications.- WARNING: The batteries connectors type are all JST PH2.0MM . —THE CONNECTORS ARE NOT UNIVERSAL! ! !— Please make sure that the CONNECTOR TYPE, POLARITY , and SIZE match your device before purchasing- Voltage: 3.7volt; Capacity: 500mAh;Maximum Charge Voltage/Current: 4.25V/325mAh; Material: .- Connector Type: PH 2.0mm;Size: 30 x 25 x 5mm / 1.18" x 0.98" x 0.2" (L*W*T); Cable Length: 5cm / 2"; Net Weight: 9g.- NOTE: The 3.7V 500mAh 502530 is NON-POWER ! ! ! It can not be used for power device that require high current such as UAV, mini RC Helicopter,RC small drones, Model aircraft , Electric toys, Power tools and other.- Application:Suitable for MP3/MP4, ,, baby monitor, game boy, ,smart ,monitoring units, POS machine, dashcam, mobile power, Bluetooth speaker, VR glasses, beauty devices, pet tracker,ring video doorbell et"