Haier CG300 Getting To Know Manual page 3

Keep the phone and all its parts, including accessories, out of the reach of
small children.
Use only approved batteries and chargers. Disconnect the charger from the
power source when it is not in use. Do not leave the battery connected to a
charger for more than a week, since overcharging may shorten its lift.
Only qualified personnel should service the phone or install the phone in a
vehicle. Faulty installation or service may be dangerous and may invalidate
any warranty applicable to the device.