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Tech Note | Comparison of VRLA Battery Technologies

Gell Cells versus AGM

These type of batteries should never be referred to as “sealed” or “maintenance-free” batteries because they are neither.

  • They are not sealed because they have a pressure-relief valve which will open if the battery’s internal pressure rises above a preset safe recombinant level.
  • They are not maintenance-free. The IEEE requires them to have as much periodic maintenance as Vented Lead-Acid (VLA) flooded batteries.

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