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Similar to the S6 posted recently; just the 4A version. Looks like its $20 off via a store coupon on the product page.
BATTERY CHARGER, MAINTAINER & DESULFATOR —IT IS NOT A CAR JUMP STARTER. GOOLOO S4 is an all-weather battery charger, battery maintainer, battery desulfator, works excellently with all 6volt and 12 volt lead-acid locomotive batteries like WET, SLA, GEL, AGM, FLOODED, VRLA batteries and 12volt LiFePO4 batteries.
OPTIMIZING BATTERY PRECISELY— An 10-stage charging program automatically analyze battery sulfation problem, repair and pulse current charging devulcanize battery to restore the battery lost performance , compensation charging maintain the battery and ensure optimal performance without overcharging.
PLUG TO PLAY— GOOLOO S4 comes with an easy-to-follow LCD display showing charging voltage, charging mode, battery charging bar and battery levels. Built-in auto memory keeper allows for returning to the last charge mode when connected. Just connect the corresponding poles, press the button to select the mode, and forget.
VERSATILE DESIGN— GOOLOO S4 smart battery charger and maintainer can also be used as a DC power supply for powering some of the 12V DC devices( 5-14 volt, 3A MAX CURRENT) or as a memory keeper when replacing a battery. The convenient hooks for easy hanging on the wall, and weigh only 0.6kg (1.3lbs).
TOTAL PROTECTION— GOOLOO S4 smart battery charger comes multiple safety features to ensure maximum safety during use. It offers short circuit protection, overload protection, low-voltage protection, high-voltage protection, overcharge protection, over-temperature protection, reverse-connection protection, and over-current protection. It's got IP65 protection which means you can use it anywhere with an outlet.
AUTO REPAIR WHEN CONNECTED—The auto repair mode is suitable for topping off stored batteries between uses so that they are always ready to go when you are. Note: It may not be possible to repair a deep-discharged battery.
CHARGING PEAK CURRENT—It supplies 4A current for charging up to 100AH 12V lead-acid batteries, and 2A current for up to 30AH 6V lead-acid batteries.
Was $47.99 for the last week (finished yesterday). Probably wait for a better deal unless you need it straightaway.