LG E420 Owner's Manual

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Align the back cover over the battery compartment (1) and press it down until it 
clicks into place (2).
Charging the phone
Charge the battery before using it for the first time. Use the charger to charge the 
battery. A computer can be also used to charge the device by connecting them via the 
USB cable.
 WARNING
Use only LG-approved chargers, batteries, and cables. When using 
unapproved chargers or cables, it may cause battery charging slowly or 
pop up the message regarding slow charging. Or, unapproved chargers or 
cables can cause the battery to explode or damage the device, which are not 
covered by the warranty.