2pcs 3.7V 500mAh battery for Udi U818A U818 RC Helicopter spare part Go to amazon.com Related posts Top 10 recommendation udi u818a battery 2022 FeatureBatteries equiped with Protection Board for safe charging and usingReplacement part 3.7V 500mAh battery for U818AType:Lipo Description2pcs 3.7V 500mAh battery for Udi U818A U818 RC Helicopter spare part