Charge the Battery
The M450 has an internal, rechargeable battery. Use the USB cable included in the product set to charge it via the USB port on your computer. You can also charge the battery via a wall outlet. When charging via a wall outlet use a USB power adapter (not included in the product set). If you use an AC adapter, make sure that the adapter is marked with "output 5Vdc" and that it provides a minimum of 500mA. Only use an adequately safety approved AC adapter (marked with "LPS", "Limited Power Supply" or "UL listed").
- Lift the rubber cover off the USB port. Plug the micro USB connector into the USB port in the M450, and plug the other end of the cable into your PC.
- Charging appears on the display.
- When M450 is fully charged, Charging completed is displayed.
Don't leave the battery fully discharged for a long period of time or keep it fully charged all the time, because it might affect the battery life time. Keep the USB port cover closed when not in use.
Do not charge the battery when the M450 is wet.
Do not charge the battery in temperatures under 0 °C / 32°F or over +50 °C / 122 °F. Charging your M450 in an environment where temperature is not within this temperature range may permanently damage the battery capacity - especially if the temperature is higher.
Battery Operating Time
The battery operating time is up to 16 hours with GPS and heart rate sensor. The operating time depends on many factors, such as the temperature of the environment in which you use your M450, the features you select and use (e.g. the use of the front light reduces the operating time), and battery aging. The operating time is significantly reduced in temperatures well below freezing.
Low Battery Notifications
Battery low. Charge
The battery charge is low. It is recommended to charge M450.
Charge before training
The charge is too low for recording a training session.
A new training session cannot be started before charging M450.
When the display is blank, M450 has either gone to sleep mode or its battery is empty. M450 goes to sleep mode automatically when it's in time view and you haven't pressed any button for ten minutes. It wakes up from sleep mode when you press any button. If it doesn't wake up, it's time to charge.