A power supply method and system for mobile phone

The invention discloses a handset power supply method and system. The method can realize a function that a handset is compatible with a disposable battery and a lithium battery. The method comprises following steps: a battery mounting step in which the lithium battery or the disposable battery is mounted in a handset battery seat; a judging step in which a handset CPU judges that the mounted battery is the disposable battery or the lithium battery, if the mounted battery is the lithium battery, a lithium battery power supply step is executed, and if the mounted battery is the disposable battery, a disposable battery power supply step is executed; the lithium battery power supply step in which the lithium battery supplies power to the handset, and the handset is set in a rechargeable mode; the disposable battery power supply step in which the disposable battery supplies power to the handset, and the handset is set in a non-rechargeable mode. The technique scheme of the invention firstly judges the mounted battery is the disposable battery or the lithium battery, then determines whether providing the chargeable mode, in this way, not only the lithium battery and the disposable battery power can be used as the power supply of the handset, but also battery explosion accidents induced by miss-charging can be avoided.