Harland Simon manufacture a range of Free Standing Battery Cubicles which are designed to work with any Single Phase UPS.  The cabinets are designed in four sizes which enable the autonomy to be increased from 1 to 24 hours typically. 

They have their own battery charger sized accordingly to provide an option of re-charge times 12, 24 or 48 hours.

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electrical industry ups and battrey charger news, electricaldigest.co.uk