Radio B Tech Smart BMS 12V 4 Series Cell 120A Lithium Lifepo4 Battery Management PCB Protection Board with Balance Leads and Wireless Bluetooth Module - Supports 4 3.2 Cells 12.8 Volts DIY Programmable Smart BMS 12V 4S 120A Lithium Lifepo4 Battery Management with Bluetooth US Stock Includes Bluetooth Module for iPhone and Android connection. Ships from USA.Operating voltage range10-14.6VOperating current MAX120AOver-charge protection voltage3.65±0.05VOver-discharge protection voltage2.5±0.05VBalanced turn-on voltage3.4±0.05Charging over current protection value130±10AHigh Temperature protection65±2℃Internal resistance≤10ΩProduct Description It is an intelligent protection board scheme specially designed for 4 series battery packs of start-up battery and electric energy storage products. It is suitable for lithium batteries with different chemical properties, such as lithium ion, lithium polymer, lithium iron phosphate, etc. The protection board has strong load carrying capacity and the maximum continuous discharge current can reach 120A.● 4 cell series protection ● Various protection functions for charging and discharging ● Discharge over current, short circuit protection functional processes of hardware ● Over voltage, under voltage, temperature and overload protection function processing of software ● Accurate SOC calculation with automatic SOC learning function ● UART communication function, can read all data of battery in real time and upgrade online ● Very low static current consumption ● The reserved switch controls the output of protection board * Desktop App requires UART USB module. Not Included. Fully Programmable Smart BMS with Bluetooth with Android or iPhone App.The charge and discharge using the same port.Smart BMS is designed for 4 series (4S 12V) Lithium (Lifepo4) DIY Battery Pack. 4 x 3.65 =14.6V Lifepo4 Chemistry battery120A versionProtection functions : This BMS is designed with a high quality IC chip specially for lithium battery protection. High detection precision degree on over-charge, over-discharge, voltage balancing.Protection of over-discharge and over-current detections and delay times in detecting process.Protection against over-voltage when charging Low temperature charging protection a -1c.BMS with Precise SOC calculation with SOC function with automatic learning. Automatically charge battery function or static balance function for the battery system.Mobile phone software to manage the detecting the battery working status and some parameters setting over wireless bluetooth.Lithium Technology: Deep cycle lithium ion batteries have exceptional longevity since they manufacturing by LiFePO4 Cells with higher energy density, more stable performance & greater power, letting you use the battery more freely. Lifepo4 are more cost effective, so when factoring time and cost into your purchase.The protection board has various protective functions for charging and discharging, such as overcharge protection, over-discharge protection, short circuit protection and over-current protect. Choosing a protection board and applying it appropriately is vital to the longevity your batteries.It is ideal for home DIY and RV batteries with a wide rage of battery applications.Protection function descriptionOvercharge protection: When the battery is under the charging state, the voltage keeps going up. Fast shipping from the US.