Intai offers a array of best Li ion battery charger including Part No. IN2102500 automatic 21V 2.5A battery charger for lithium batteries which employs superior 5 stage charge algorithm. The 21V charger provides error proof operation fully. The 24 volt smart battery charger features • Designed to prevent overcharging • Backfeed protection • Reverse polarity protection • Short circuit protection • Spark-free operation• With XLR connector port •UL/cUL, CE, RCM, PSE approval for battery charger li ion • Customizable for additional features • High efficiency and compact design