Maintenance free battery definitions

maintenance-free battery

secondary battery which, during the service life, requires no maintenance provided specified operating conditions are fulfilled
Found on http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=482-05-25

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Maintenance-Free Battery

A sealed battery to which water cannot be added to maintain electrolyte level.
Found on http://www.encyclo.co.uk/local/21690

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