Check the listing for details. OPTIMATE 7 GOLD SERIES BATTERY CHARGER MAINTAINER TM250 V3 TECMATE 12V. Condition: New. Listed at 207.73 USD. The "PRO choice" charger that maximizes the potential of your high-performance 12V battery. Includes a power supply to support the battery while tuning/troubleshooting. Select a charging voltage of 14.4V for most batteries or 14.7V for premium AGM batteries, or select the power supply support mode – your selection remains in memory even if AC power is lost. The fully automatic, multi-step program safely brings the battery to full charge: plug in the battery and the OptiMate 7 Select does the rest, with no supervision required! Temperature compensation: The voltage is adjusted higher when it is cold or lower when it is hot. Safe to leave plugged in. Complete electronic protection. 24/7 Keeps your battery fully charged and in good condition. Eco-friendly technology: 50% less energy, 50% lowe.