We have developed long float service life small-capacity VRLA battery in tele-communication application. We had reported file development of medium size (12 V 15 - 65 Ah at 20 hours rate), life expectancy of 13 years at 25 degree C, VRLA batteries in 1997 1. We have developed the advanced technologies, especially in the point of the suppression of dry-out failure, and applied them to the small-capacity VRLA batteries, because the dry-out failure was the most prominent for these small-capacity VRLA batteries. It could be achieved by employing a new container plastic material with a low moisture permeability ratio. We provided 12 V 7 Ah (at 20 hours rate), 10 years expected life at 25 degree C, VRLA battery with these newly developed technologies.
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