Automatic Battery Charger For Blue Tank M4(Doesn't Fit White Tank)

Fully automatic battery charger for 12 volt 8 AH sealed lead acid battery. Charger adjusts current based on battery voltage. Indicator light shows red when charger is plugged into the M4 and charging the battery. The indicator light turns green when the battery is fully charged and ready for use. Charger changes to long term battery maintenance mode after full charge has been achieved. Plug charger in all year long to optimize battery life. Red light flashes if charger cannot resolve a problem with the battery. This fits only the Blue Tank M4.