Huawei E5786 E5786s-32a Qucik Start - Page 16

 The microSD card is an optional accessory. If no microSD card is included in the package, please purchase one separately. Charging the Battery The device has a built-in, non-removable battery. Do not attempt to remove the battery, otherwise the device may be damaged. To replace the battery, take the device to an authorized service center. If the Mobile WiFi has not been used for a long time or if the battery is fully depleted, the Mobile WiFi may not power on immediately after the charger is plugged in. Please charge the battery for a while before attempting to power on the Mobile WiFi. Method 1: Use the charger to charge the device Note:  Only use chargers compatible with the Mobile WiFi and provided by a designated manufacturer. Use of an incompatible charger or one from an unknown 15