A sealed battery is a liquid electrolyte battery equipped with a system to prevent the evaporation of the water contained in the electrolyte, by gas recombination. These batteries do not require maintenance, and are often called VRLA for "Valve Regulated Lead-Acid batteries".
| Advantages | Disadvantages |
|---|---|
| Reduces explosive gas production, water loss and leakage. | Does not allow maintenance or control. |
| Requires less maintenance. | Imposes a perfectly regulated load according to the temperature to avoid gas losses by excessive pressure. |
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