The permanently sealed VRLA battery never needs refilling, however, it still needs periodic charging. This is a condition where a crystal like material forms on the lead plates. This is NOT caused by a faulty battery, it is a fault with maintenance.
Yuasa YTZ10S (WC) 12V Factory Activated High Performance MF VRLA Battery
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Yuasa TTZ10S (WC) 12V Factory Activated MF VRLA Battery
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