I bought these larger size sippy-mugs from Wal-Mart and plan to use one as an overflow bottle and another as a bubbler. If the cell is very full it will overflow some electrolyte to the overflow bottle. If the overflow bottle is empty during cell operation the cell may be getting low on water. All you need to do is add a small amount of water to the overflow bottle and if the cell is low it will siphon the water back into the water tank once cell is off and cools. Having a clear overflow bottle is perfect to monitor cell water level.

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