Generally batteries are said to be leak proof if the electrolyte does not come out even if the battery is kept at any position. Many primary batteries use electrolyte contained by an absorbent or separator material (there is no free or liquid electrolyte) and are termed `dry cells' (E.g., Zn-Carbon, Alkaline-Manganese Cells)
Since the electrolyte is not in the liquid form and further primary cells are not meant for recharging it is packed tightly and sealed, whereas secondary batteries need to be provided with adequate mechanism to permit the release of gases that form during re-charging. Further, most of the secondary batteries have liquid electrolyte except few gels or absorbent type electrolyte. For example, some lead-acid battery designs (used in UPS applications) use absorbent type or gel type electrolyte and these batteries can be installed at any direction without any electrolyte leakage and are claimed as leak proof.
Courtesy : The Hindu
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