Sealed car batteries.
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rob needs
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Sealed car batteries.
I was about to charge up a spare battery and noticed its a sealed type.Having never owned one of these before i was worried about it blowing up.Whats inside them so that they never have to to topped up with water?It didn't blow up by the way.
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Forumadmin
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Exactly the same as an unsealed one. They have a valve
http://en.wikipedia.org/wiki/Lead_acid_ ... _batteries
The Valve Regulated Lead Acid (VRLA) battery is one of many types of lead-acid batteries. In a VRLA battery the hydrogen and oxygen produced in the cells largely recombine back into water. In this way there is minimal leakage, though some electrolyte still escapes if the recombination cannot keep up with gas evolution. Since VRLA batteries do not require (and make impossible) regular checking of the electrolyte level, they have been called Maintenance Free (MF) batteries. However, this is somewhat of a misnomer. VRLA cells do require maintenance. As electrolyte is lost, VRLA cells may experience "dry-out" and lose capacity. This can be detected by taking regular internal resistance, conductance or impedance measurements of cells. This type of testing should be conducted on a regular basis, as an indicator that more involved testing and maintenance may be required. Recent maintenance procedures have been developed allowing "rehydration" of cells that have experienced dry-out, often restoring significant amounts of the lost capacity.
http://en.wikipedia.org/wiki/Lead_acid_ ... _batteries
The Valve Regulated Lead Acid (VRLA) battery is one of many types of lead-acid batteries. In a VRLA battery the hydrogen and oxygen produced in the cells largely recombine back into water. In this way there is minimal leakage, though some electrolyte still escapes if the recombination cannot keep up with gas evolution. Since VRLA batteries do not require (and make impossible) regular checking of the electrolyte level, they have been called Maintenance Free (MF) batteries. However, this is somewhat of a misnomer. VRLA cells do require maintenance. As electrolyte is lost, VRLA cells may experience "dry-out" and lose capacity. This can be detected by taking regular internal resistance, conductance or impedance measurements of cells. This type of testing should be conducted on a regular basis, as an indicator that more involved testing and maintenance may be required. Recent maintenance procedures have been developed allowing "rehydration" of cells that have experienced dry-out, often restoring significant amounts of the lost capacity.