User's Manual

Index 18
Battery Charging Cautions
Charging Conditions: Under low temperatures charging performance decreases. Charge in
temperatures between 5°C – 35°C. Do not charge in places where there is high humidity. USB
charging may be unavailable depending on Wi-Fi router temperature.
Use Supplied Accessories: Always use the supplied AC adapter or micro USB cable.
Precaution for Extended Use: Your device may become hot when used for a long time or while
charging, especially in high temperatures. Prolonged contact with skin may cause low-temperature
burn injuries.
The R850 and AC Adapter Becoming Warm or Hot: Your device and the AC adapter may become
warm while charging. This is not a malfunction. However, stop using them immediately if they become
extremely hot; this could indicate a malfunction.
Charge Using the AC Adapter
Use the supplied AC adapter.
1. Plug the AC adapter into an electrical outlet.
 The indicator light illuminates when charging starts. The light turns green when the battery is
fully charged. Fully charging a battery may take up to three hours.
2. After charging, disconnect the device from the charger.