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[Porvoon Hilma]

Alkuperäinen kirjoittaja -MaTTi-

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Tuolla se tuntuu lukevan, mutta voihan se olla, että tässä ei oo ihan koko totuus. niinkuin BJ-40/76 tarkensi noista kalsiumeista.

Tarttee näköjään jatkaa akkututkimuksia

Vikipedia:
Comparison with flooded lead–acid cells

VRLA batteries offer several advantages compared with flooded lead–acid cells. The battery can be mounted in any position, since the valves only operate on overpressure faults. Since the battery system is designed to be recombinant and eliminate the emission of gases on overcharge, room ventilation requirements are reduced and no acid fume is emitted during normal operation. The volume of free electrolyte that could be released on damage to the case or venting is very small. There is no need (nor possibility) to check the level of electrolyte or to top up water lost due to electrolysis, reducing inspection and maintenance.[4]

Tää kohta:
Because of calcium added to its plates to reduce water loss, a sealed battery recharges much more slowly than a flooded lead acid battery.[5][6]

Compared to flooded batteries, VRLA batteries are more sensitive to high temperature, and are more vulnerable to thermal run-away during abusive charging.[1] The electrolyte cannot be tested by hydrometer to diagnose improper charging, which can reduce battery life.[7][6]

Noi lähdeteokset tässä alla:
[5]^ Barre, Harold (1997). Managing 12 Volts: How to Upgrade, Operate and Troubleshoot 12 Volt Electrical Systems. Summer Breeze Publishing. pp. 44. ISBN 0-9647386-1-9.(stating sealed battery plates are hardened with calcium to reduce water loss which "raises the batteries' internal resistance and prevents rapid charging.")
[6]^ a b Sterling, Charles (2009). "FAQ: What Is The Best Battery System to Use for an Auxiliary Charging System". Retrieved 2 February 2012.(discussing excessive cost and poor performance of newer sealed gel or AGM batteries versus regular lead-acid flooded batteries in leisure boats.)