Features: OOTDTY Brand new and high quality. Refillable for reuse, eco-friendly Long life more than 1000 times Short circuit and overcurrent for protection. You can use the 4.2V 26650 battery charger to charge the battery. Over-discharge may cause damage, this 18650 battery has a PCB for protection, can help to extend the battery life. Capacity: .5000mAh (due to the conversion rate, the capacity will be less than 5000mah, buyer should charge the battery with full for the time before testing) Withstand large current discharge, the maximum operating current: 3.2A Voltage: 3.7V Color: black Size: 67x25.8mm Chemistry: Li-ion Rechargeable: Yes Protected Board PCB: Yes Widely Used in LED flashlight, headlamp and other electronic products. Due to adding battery for the protection board, it is not suitable for some brands of electronic cigarettes. Warnings: -Never reverse the positive and negative. -Never connect the positive and negative of the battery with metal . -Never ship or store the battery together with metal such as a hairpin. hair, necklace, etc. -Never throw or step on the battery. -Never throw the battery into water or fire; keep it in dry, shady and cool circumstances when not in use. The suggested temperature for storage at long term is 10-45. -Never use the battery under strong static and magnetic field, otherwise it will destroy the protection device. -If the battery emits a smell particular, heats up, deforms or appears unconventional during use, storage or charging process, please remove it from the device or charge it and stop using it. use. -If the battery leaked, the electrolyte gets into the eyes, please do not knead, wash the eyes with water and send to the hospital. -Never cut the battery with a nail or other edge tool; the waste battery should be returned to the supplier and handled by the recycling station. Note: 1.Transition: 1cm=10mm=0.39inch 2. Please accept an error of 0 to 1cm due to manual measurement. Please make sure you do not mind before you bid. 3. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package includes 1x 26650 3.7V 5000mAh Rechargeable Battery