Leader is a valve-regulated, lead-acid battery of type AGM (Absorbed Glass Mat) designed to fit most cyclic and standby applications.
Lead-Calcium alloy contributes to low self-discharge and a long life. By construction, the LEADER batteries are leak-proof. Among other things, they are approved for air transportation according to IATA and they are UL-approved according MH20721. The batteries are sealed and neither should nor can be replenished.
It’s “High Performance” according to EUROBAT classification, which means it will last 10-12 years on standby.