Where is quality and cheap 3.7v lithium polymer battery 350mah made in China? Dongguan Encore Energy Co.,Ltd. is definitely your good choice. We are known as one of the most professional 3.7v lithium polymer battery 350mah manufacturers and suppliers in China. We have our own factory and we can provide our customers with newest Factory directly supply 3.7v lithium polymer battery 350mah, which can be customized. In addition, our products are not only UL certificated, but also the price is very favorable. You are welcomed to contract us and buy what you need with our price list and quotation. Our products have a wide range of applications, including Bluetooth headset, toy, vape, e cigarette, Digital, smart watch, Drone, RC, Bluetooth speaker, etc.