Essential RC accessory for 4WD RC car enthusiasts: a digital battery capacity tester that helps you monitor battery health and optimize performance during operation. Versatile testing capabilities: supports testing for lithium polymer (LiPo), lithium iron (LiFe), and lithium ion (Liion) batteries. provides comprehensive measurements including cell voltage, total voltage, minimum cell voltage, maximum cell voltage, voltage difference, and remaining capacity percentage. Durable construction: built with quality plastic and metal composite materials for rugged RC use and longlasting service life. Clear display: features a userfriendly 2.1inch display that shows all battery parameters at a glance, making it easy to monitor battery status before and after use. Use scenarios Before a race or bashing session: check total voltage and percell voltages to ensure cells are balanced and within safe limits. During a long run: monitor remaining capacity percentage to manage power and prevent midsession failures. After use: review minimum and maximum cell voltages and voltage difference to detect potential cell issues and plan maintenance or replacement.