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Battery In-Use Compliance
In-use compliance covers a battery from deployment to retirement: monitoring, fault response, maintenance, incident records and the unit's identity history. These records support audits, recalls, second-life screening and end-of-life decisions.
- Operational monitoring and thresholds: temperature, voltage, current, state of charge (SOC), state of health (SOH).
- Event detection and escalation: overtemperature, internal fault, isolation fault, abnormal charging.
- Maintenance, inspection and safe handling procedures.
- Incident reporting and evidence capture.
- Lifecycle recordkeeping.
Identity and evidence are lost after deployment
Repairs, firmware updates, module swaps and repurposing break the link between a unit and its records unless each change is captured. Keep a chain of identity and custody from deployment through service to retirement.
| Failure | What it looks like | Resulting risk |
|---|---|---|
| Unit identity lost | Serials not captured, labels destroyed, modules swapped without mapping | Recall scope, audits and end-of-life decisions cannot be supported |
| Event data not retained | Battery management system (BMS) logs overwritten or never exported | Root-cause investigations fail; liability exposure rises |
| Informal maintenance | Service without controlled procedures or training records | Unsafe handling and inconsistent outcomes |
| Damaged, defective or recalled (DDR) packs treated as normal stock | Returned or suspect packs held with normal inventory | Transport and storage violations; higher incident probability |
Monitoring, alarms and BMS configuration control
Monitoring thresholds, response actions and log retention determine how unsafe states are detected and what evidence exists afterward, so they belong under change control. Repeated overtemperature events are a common trigger for moving a battery into higher-risk handling, transport and storage.
| Signal category | Examples | Why it matters |
|---|---|---|
| Thermal | Cell, module and enclosure temperatures; cooling loop indicators | Overtemperature is a leading precursor to thermal runaway |
| Electrical | Voltage, current, isolation resistance, contactor status | Isolation faults and abnormal current are safety-critical |
| State estimation | SOC, SOH, cell imbalance, degradation indicators | Sets safe operating limits and informs end-of-life decisions |
| Event logs | Fault codes, trips, protective actions, firmware changes | Primary evidence for incident investigations |
- Control BMS firmware versions and change history per model, and per unit where applicable.
- Define the safety-relevant parameters (limits, trips, protective actions) and restrict who can change them.
- Retain event logs for incidents and near misses under a record retention policy.
The field evidence loop (telemetry and alarm logs, incident workflow, corrective action, retest triggers) is covered on Battery Testing Lab & Field Requirements.
Maintenance, service and repair controls
| Control | What to do | Evidence |
|---|---|---|
| Service procedures | Controlled procedures for inspection, diagnostics, safe isolation and component replacement | Procedure revisions and training records |
| Identity preservation | Map swapped modules; preserve unit identity where required | Service record with before and after mapping and serials |
| DDR screening after events | Define when a battery becomes damaged or defective and must be segregated | Screening checklist and disposition record |
| Parts control | Approve replacement parts and alternates | Controlled parts list and deviation approvals |
Minimum incident file
Build the incident file from a standard template at the time of the event; files reconstructed later are incomplete.
| Item | Contents | Why it matters |
|---|---|---|
| Unit identity and configuration | Serials, model revision, location, operating mode | Identifies the affected population |
| Event timeline | Alarms, protective actions, human response, external impacts | Supports root-cause analysis |
| Logs and telemetry | BMS logs, system telemetry, operator actions, firmware changes | Primary evidence for the investigation |
| Containment and disposition | Isolation, storage decision, DDR classification, shipment plan if removed | Sets transport and storage requirements after the incident |
| Corrective actions | Corrective and preventive actions (CAPA), design changes, procedure and training updates | Shows systemic prevention |
Links to other lifecycle stages
- Battery Transport & Storage Controls: an incident can move a battery into DDR handling and shipment.
- Battery Second Life Compliance: SOH and event history decide whether reuse is defensible.
- Battery End-of-Life Handoff Controls: custody records and hazard status carry into treatment.
- Digital Battery Passport Basics: where passports apply, lifecycle updates depend on unit identity continuity.
Related Coverage
- Battery Materials & Sourcing Compliance
- Battery Manufacturing Compliance
- Battery Transport & Storage Compliance
- Battery Second Life Compliance
- Battery End-of-Life Handoff
Disclaimer. Informational guidance only. Not legal advice. In-use obligations and expectations vary by jurisdiction, product type, industry, and customer requirements. Use this page to structure operational controls and evidence retention, then validate requirements for your deployments and markets.