The United States customers attention: When you select "Ship From United States" , the following addresses will not provide delivery service: Hawaii, Alaska, Puerto Rico, Guam, APO, DPO, FPO, etc . Recommend you to choose " Ship From China ".Thank you Clientes de Espaa atencin: Cuando selecciona "Enviar desde Espaa" , el servicio de entrega no est disponible en los siguientes cdigos postales: 35000-35999 38000-38999 Se recomienda que elija " Enviar desde China " . Gracias! ! ! (3S 5A Standard/3S 10A Standard/4S 20A Standard/3S 20A Enhance/3S 40A Enhance/3S 60A Enhance/4S 40A Enhance/3S 25A Balance/3S 40A Balance/3S 60A Balance/4S 40A Balance)--Board Module Specification: Specifications: Standard: 3S 5A Standard, 3S 10A Standard, 4S 20A Standard (optional) Enhance: 3S 20A Enhance, 3S 40A Enhance, 3S 60A Enhance, 4S 40A Enhance (optional) Balance: 3S 25A Balance, 3S 40A Balance, 3S 60A Balance, 4S 40A Balance (optional) Standard 3S 5A Standard: Size: 40 * 15 * 1mm/1.57 * 0.59 * 0.03inch Charging voltage: DC 12.6-14V Maximum working current: 4-5A Maximum instantaneous current: 6-7A Battery over discharge voltage: 2.3-2.6V Battery over discharge protection recovery voltage 4.1-4.2V Battery over discharge current protection point: 5.5~6.5A Battery overcharging protection voltage point: 4.2-4.3V Battery overcharge protection recovery voltage: 4.1-4.2V Applicable options: Suitable for lithium batteries with a nominal voltage of 3.7V and a fully charged 4.2V (including 1865026650 and polymer lithium batteries) 3S 10A Standard: Size: 50 * 16 * 1mm/1.96 * 0.62 * 0.03inch Charging voltage: 12.6V-13V; Maximum working current: 10A; Overcurrent protection: 25A; Static current: less than 6uA; Internal resistance: less than 60m ; Overcharge voltage range: 4.25-4.35v 0.05v; Overdischarge voltage range: 2.7-3.0v 0.05v; Short circuit protection: Protectable, delayed self recovery. Special reminder: Calculation of charging and discharging current for lithium batteries: When using modules, you may encounter situations where the maximum charging and discharging current of the battery is estimated. The following explains the formula for calculating the maximum charging and discharging current of lithium batteries. The calculation formula is: maximum charging and discharging current=Nameplate capacity * C. For example, if a lithium battery has a nominal capacity of 2200mAh and a discharge rate of 2C, its discharge current is 2200 * 2=4400mA=4.4A. 4S 20A Standard: Size: 34.5 * 34.5 * 1mm/1.35 * 1.35 * 0.03inch Overcharge voltage range: 4.25-4.35V 0.05V Overdischarge voltage range: 2.3-3.0V 0.05V Upper limit working current: 10A Working temperature: -40-+50 Upper limit instantaneous current: 20A Quiescent current: less than 30uA Internal resistance: less than 60m Short circuit protection: Protectable, requires charging and recovery Charging voltage: 16.8V-17V Enhance 3S 20A Enhance: Size: 20 * 60 * 4mm/0.78 * 2.36 * 0.15inch Charging voltage: 12.6-13v Continuous discharge current: maximum 20A (if the cooling environment is not good, please reduce the load current for use) Continuous charging current: maximum 10A Applicable options: Suitable for lithium batteries with a nominal voltage of 3.7V and a fully charged 4.2V (including 1865026650 and polymer lithium batteries), capable of carrying electric drills with a starting current of less than 60A and a power of less than 100W matters needing attention: 1: Successfully starting the electric drill requires three 10C-20C power batteries, or six 5C-10C power batteries (recommended power battery models: for SONY VTC4, VTC4A, VTC5A, VTC6), 0V and 12.6V connection wires, and copper wires of more than 2 square millimeters (nickel plates cannot be used!). 2: Strictly follow the wiring diagram for 0V, 4.2V, 8.4V, and 12.6V, and do not touch any components on the board when welding the wires 3: When connecting three sets of batteries in series, please ensure that the voltage of each set of batteries is the same. If different, please fully charge each set of batteries separately before using them in series 3S 40A Enhance: Size: 41 * 55 * 4mm/1.61 * 2.16 * 0.15inch Charging voltage: DC 12.6V~13.6V Continuous discharge current: maximum 40A (if the cooling environment is not good, please reduce the load current for use) Continuous charging current: maximum 20A Applicable options: Suitable for lithium batteries with a nominal voltage of 3.7V and a fully charged 4.2V (including 1865026650 and polymer lithium batteries), capable of carrying electric drills below 170W matters needing attention: 1. Successfully starting the electric drill requires 3 10C-20C power batteries, or 6 5C-10C power batteries (recommended power battery models: for sony vtc4, vtc4A, vtc