Valve-Regulated Lead-Acid (VRLA) batteries inside uninterruptible power supplies degrade invisibly until utility power cuts. Learn how infrastructure managers schedule impedance testing and string replacements.
Vikram Malhotra
Industrial Maintenance Consultant
Uninterruptible Power Supply (UPS) battery strings operate under continuous float charge. Electrolyte loss, grid corrosion, and sulfation occur invisibly without physical casing distortion until load is applied during a utility power failure.
Routine quarterly or semi-annual maintenance contracts must mandate ohmic testing of each battery cell. A 20% rise in internal resistance indicates irreversible cell degradation.
Never mix new battery blocks into an aged string. Different internal resistances cause uneven voltage distribution, destroying both old and new cells prematurely. Replace entire strings as unified lots.
Track installation dates, vendor warranties, and resistance logs inside RenewOS to schedule battery string replacements before catastrophic power loss occurs.
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