LG JIL SANDER E906 Guide De L'utilisateur page 323

You cannot switch on the phone if the battery is fully discharged
It takes approximately four to five minutes to reach a charge
state sufficient for booting by TA charger.
It takes approximately 14-15 minutes longer to charge using a
USB connection.
If the battery is critically low, the image for the critically low
battery will appear to notify you to charge it longer.
NOTE: The battery must be fully charged initially to improve battery
life.
WARNING: Do not connect the charger to the phone
without the battery being installed. You must check the battery is
inserted before charging.
WARNING: Do not remove the battery or USIM card while
charging the phone.
WARNING: There is a risk of explosion if the battery is
replaced by an incorrect type. Dispose of used batteries in
accordance with the manufacturer's instructions.
WARNING: Unplug the charger from the mains and phone
during lightning storms to avoid electric shock or fire.
WARNING: Make sure that no sharp items come into contact
with the battery. This could pose a fire risk.
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