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Sealed m aint enance Free<br />
Tubular Bat t ery Wet Cell<br />
- This is, by far, the most common type of<br />
lead acid battery utilized in UPS systems.<br />
The term sealed is somewhat misleading, as<br />
it means that the battery vents only if the<br />
cell is abused by overcharging or high<br />
temperature operation. The vents open only<br />
- This is the most basic lead acid<br />
battery. This type of battery vents<br />
gases during charging and<br />
discharging and requires periodic<br />
addition of water to the electrolyte.<br />
under excessive internal pressure. By<br />
nature of the design a valve regulated<br />
battery effectively controls generation of<br />
gases and allows gas recombination within<br />
the battery of over 99% of the gases<br />
generated in normal usage. The batteries<br />
are provided with a safe low pressure<br />
venting system designed to release excess<br />
gas and reseal automatically. Normally this<br />
sealing technique should ensure that no<br />
electrolyte leakage can occur from the<br />
terminals / posts or case of the battery.
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