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United States of America Patent
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Issued Date -
Oct 1, 2015
app pub date -
Oct 29, 2013
filing date -
Oct 30, 2012
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Abstract
In the storage battery system, from the same temperature and the same voltage as both batteries a decrease per day of an open-circuit voltage of the lead-acid storage battery by a self-discharge is ΔV1(V/day) and a decrease per day of an open-circuit voltage of the sub-battery by a self-discharge is ΔV2(V/day), and a relation of ΔV1≧ΔV2 is satisfied. The sub-battery is a nickel hydride storage battery.
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