Fronius AccuPocket 150/400 TIG Operating Instructions Manual page 30

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30
Protect the power source from extreme influences
Optimum environmental conditions for operation and storage:
- Temperature: +15 °C to +25 °C (+59 °F to +77 °F)
- Humidity: 50%
- Surrounding air is free from dust and corrosive vapours or gases
If the power source is left idle, charge it on a regular basis
Fully charge the power source at least every 6 months.