What is the required liquid level inside the battery?

All cells should contain sufficient liquid to reach 1/2" to 1/4" below vent wells.  If liquid levels fall below, top up using distilled water and re-test specific gravity.

Distilled, Deionized or R/O water may be used to top up each cell as long as the PH is near 7 or Neutral.

For flooded model cell spacing reference information used in sizing watering systems, refer to the following Flooded Cell Spacing document.