How to properly refuel a four-wheel drive rough terrain forklift?

Use a hard tool to gently pry open the battery cover. Some battery covers are attached with ABS, some batteries are snapped together, and others use a sliding plate structure. Be very careful when prying open the cover so as not to damage it. At this point, the rubber caps of the six vent valves can be seen; open the rubber caps to expose the vent holes, and through the vent holes the interior of the battery can be seen. Some battery vent valve seats can be unscrewed, and the valve seat can be removed without opening the rubber vent caps; some batteries also have filler around the rubber caps. After opening the cover, first check whether there are dry areas inside the holes and the water level to determine whether the battery is short of water. The battery plates are wrapped in white glass fiber and usually need to be kept wet. Use a dropper to draw distilled water and pour it into the battery through the vent holes. Then cover the battery vents with a breathable protective cover to prevent dust from falling in. Medical distilled water is recommended. When adding water, keep the liquid level relatively low, but do not add too much; if too much water is added, it will dilute the electrolyte, reduce the acid ratio, and ultimately deplete the battery capacity. Inexperienced people can use glass, plastic, or similar droppers as water-adding tools, adding 5 ml of water to each hole. Do not use tools containing metal as water supply tools; for a syringe, remove the metal needle and replace it with a plastic tube before use.