· No Standalone lithium batteries are sold with the product.· 3.7 volt Lithium-ion Rechargeable Battery :includes 3.7V 3200mAh (11.84Wh) lithium-ion battery with JST-XH 2.54/2Pin plug,Size:φ26*66mm;Weight:91.6g.Extensively utilized as a rechargeable rc car battery for RC cars, RC boats, and RC stunt cars, and can even serve as a gel blaster battery and solar light battery.Also used as nearly all types of 3.7-volt RC car replacement batteries,voice amplifier and light batteries.· Purchase Guidelines and Notes: Please make sure this 3.7v lithium-ion rechargeable batter size(φ26*66mm) and plug type (JST-XH 2.54/2P) fits your voice amplifier, rc cars, speakers, remote control car toys and lights before your buying. Before use, please check the li-ion 3.7v rechargeable battery voltage, positive and negative polarity with the original battery, the red wire is the positive pole "+" and the black wire is the negative pole "-".· Long-lasting Performance and Large Capacity: Enjoy extended usage with approximately 980 charge and discharge cycles, providing 2-3 years of reliable power for your voice amplifier,RC cars and lights. 3.7v lithium-ion rechargeable battery with long-lasting battery life and 3200mAh large capacity ensure no interruptions to your fun.· Versatile Applications&High Compatibility: 3.7 volt rechargeable battery is commonly used as rc car battery,but also compatible with various devices including voice amplifiers, RC cars, lighting, speakers, loupes, remote control car toys, electronic RC toys and many other electronic devices, as long as the voltage and plug type are suitable. A better choice for your RC battery replacement.· Certified Quality Assurance&Lifetime Warranty:Each 3.7v li-ion battery undergoes rigorous safety examinations, meeting UN38.3 test standards such as low-high temperature test, impact test, over charging, external short circuitto ensure safety during production, shipping, and usage. If you encounter any issues caused by the 3.7 volt rechargeable battery itself, simply contact us for hassle-free replacement or refund.