All you need to know is to use distilled water and make sure the lid and nozzle are tight. It uses an airtight compartment to sense when the cell is full and stop the flow. If the cover is loose, it will not hold. Listen for air bubbles coming in, if they stop the cell is full. it's slow As long as you charge your batteries regularly, you're good to go. If you're lazy and sloppy like me, use a measuring cup and funnel to get them closer, and filler last.
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