Features: This charger is compact and light, which can charge 2S or 3S battery pack, especially there is separated corresponding balance port for each battery pack. Convenient and portable. iMax RC B3 20W 2S-3S Lipo Battery Balance Charger for RC Helicopter IMAXRC B3 20W compact charger is the best solution for 2S and 3S Lipo battery, because it is light and exquisite, 20W Max power, 1.6A charge current, AC function, especially there is separated corresponding balance port for each battery pack. It is Very suitable for RC cars and helicopters Firstly, please connect the B3 with the power supply, and then the three LED lights will become green, which indicates the charger works in good order. Secondly, please connect the 2S or 3S Lipo battery to the balance port, and then the LED lights will become red and it begins to charge the battery. Please note that if one cell battery is fully charged, the corresponding LED light will become green. After all the LED lights all become green, the charging process is finished. Pls terminate the charge process. Specifications: Material: ABS Plug Type: EU Power Input Voltage: AC 100 to 240V AC 50/60HZ Output current: 1600mA Display: 2 x Bicolor LED Power Output: 20 Watts Charge current: 1.6A Battery Type: LiPo 2S-3S (Series) Size: 90mm*58mm*34mm Weight: 126g Packing includes: 1 * B3 20W Charger 1 * Power Adapter 1 * Manual