# SDR O2GA2020062490401

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 19, 2020
- Submitted: June 24, 2020
- Operation: Air carrier
- Aircraft: [N904UP](https://openairdocs.org/aircraft/N904UP), registered now
- Make and model: Cessna 750
- Registry model: [Cessna 750](https://openairdocs.org/model/cessna-750) (OpenAirDocs)
- Aircraft serial: 7500130
- Aircraft time: 15,529 hours, 9,961 cycles
- System (JASC): [2432 · Battery/Charger System](https://openairdocs.org/jasc/2432)
- Part: Battery
- Part number: 991405811
- Part serial: 001CA0D5
- Condition: Overtemp
- Location: Master
- Part time: 1,188 hours, 782 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: M, J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/O2GA2020062490401

## Discrepancy

DURING CRUISE FLIGHT AT FL430, WE EXPERIENCED A MASTER WARNING FOR A NR 1 BATTERY OVER TEMPERATURE. THE TEMPERATURE WAS INDICATING 63 DEGREES C. THE EMERGENCY PROCEDURE CHECKLIST WAS PERFORMED. THE TEMPERATURE CONTINUED TO CLIMB OVER AN APPROXIMATELY A 10 MINUTE PERIOD TO 65 DEGREES CELSIUS. AT THAT TIME, A CREW DECISION WAS MADE TO DIVERT. MAINTENANCE REPLACED THE LEFT AIRCRAFT MAIN BATTERY. OPERATIONAL CHECKS PERFORMED WITH NO DEFECTS NOTED. AIRCRAFT WAS RETURNED TO SERVICE.

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