28
However, the user must observe the following key points in order to guarantee maximum 
service life of the battery:
- Recharge the battery after every discharge
Do not wait until the battery is completely discharged before recharging it.
- 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
- Regularly charge the power source when not in use
- Fully charge the power source at least once every 6 months