What's the matter with maintenance-free battery not charging?

[SanAustin]

Maintenance-free battery not charging may be due to internal disconnection or short-circuit damage. Maintenance-free batteries cannot be refilled with liquid as they lack refill ports. If the battery shows poor charge retention or fails to hold charge after charging, replacement is the only option. For maintenance-free batteries, adding electrolyte is not recommended as it disrupts internal mechanisms - the proper approach is regular charging. Two solutions: 1. Use a smart charger with activation mode. 2. Charge by connecting it in parallel with another charged battery. Additional details: 1. Maintenance-free batteries produce minimal gas during normal charging, feature strong overcharge resistance, low internal resistance, excellent cold-start performance, and longer lifespan than conventional batteries. 2. They require no distilled water refills during service life and need no supplemental charging when the charging system functions properly, though electrolyte specific gravity should be checked during maintenance.