Compatible：VXI BlueParrott B250-XT Bluetooth Headset Battery Replacement,B250-XT+ ver E,N2 dashcam,Nextbase dash cam 402G 412GW 512G ,Cobra 840,Skyrc GPS,Roadwarrior,training collar,Keychain cam 808 small camera C3,C11 16 ,602030. More Other 3.7~5V electronic products with power less than 1.11Wh (310mAh). | 502030 rechargeable lithium ion polymer battery, nominal voltage 3.7V, full charge voltage 4.2V, capacity 310mAh, power 1.11Wh, battery size 1.22in×0.787in×0.2inch (L*W*T), prevent overcharge, overdischarge, overcurrent and short circuit . | It‘s consists of of large-capacity A+ lithium battery, Japanese Seiko IC overcharge and overcurrent short circuit protection board, 3302-26 high temperature resistant silicone cable, and genuine JST Pitch1.25mm 2-pin connector module. | The red wire is the positive electrode “+” and the black wire is the negative pole “-”。In some products, the original battery has no plug or the plug does not match. It doesn't matter. You can directly cut off the plug and weld it or use our heat shrinkable insulating sleeve to connect the wires of the same color. | If there is any quality problem within one year, it will be replaced free of charge.