The Power-Sonic PSC-12500ACX is a 12V 500mA switch-mode automatic charger for sealed lead acid batteries. Optimized for SLA batteries with capacities between 2Ah and 5Ah, this dual rate charger comes with two charging modes; a "FAST" charging mode to fully recharge your battery and "FLOAT" charging mode to maintain full power once charging is complete. Comes with overcharge and reverse polarity protection.