Huawei E5331 Quick Start Manual page 8

Charging the Battery
If the battery has not been used for a long time, it must be charged first.
Method 1: Using the charge
Caution:
Only use chargers compatible with the

Mobile WiFi and provided by a designated
manufacturer. Use of an incompatible
charger or one from an unknown
manufacturer may cause the Mobile WiFi
to malfunction, fail, or could even cause a
fire.Such use voids all warranties, whether
expressed or implied, on the product.
The charger is an optional accessory. If the charger is not provided in the package,

you can contact your local dealer to buy one yourself.
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