UPS battery cell impedance rise vs baseline that triggers investigation under the battery-maintenance program
20-25%estimate
| Value kind | estimate — Interpret this value according to its displayed kind, scope, source, and as-of date. |
|---|---|
| Scope | A screening trigger, not a universal threshold: the acceptance limit depends on battery chemistry and construction, the measurement method and instrument, the commissioning baseline and cell temperature, and the OEM's published limits. A repeatable rise opens an investigation and the prescribed capacity or condition assessment. |
| Caveat | Impedance does not measure remaining capacity and does not establish that a cell will open at the next transfer. Replacement follows the approved battery-maintenance program (IEEE 450/1188-class capacity testing for lead-acid, or the OEM protocol). |
| As of | 2025 |
| Source | Gerchamp |
| Review | checking…review by 2026-08-26 · standard cadence |
| Recorded changes | last 2026-07-14 · 2 revisions tracked |
| Claim id | ups-battery-cell-impedance-rise-vs-baseline |
Where the guide uses it
← Full numbers register — every date-stamped figure in the guide, with revision history.