| 摘要 |
A mobile telephone battery power supply unit consisted of a housing covered with a slide cover to hold an electronic circuit assembly and battery case on the inside. The electronic circuit assembly includes a charging circuit controlled to recharge the rechargeable battery of a mobile telephone, a power detection circuit controlled to detect the current power level of the rechargeable battery of the mobile telephone, and a discharge circuit controlled to discharge the residual voltage out of the rechargeable battery of the mobile telephone before each recharging operation so as to eliminate possible "memory effect", which prohibits the rechargeable battery from being fully charged to the saturation state. The battery case receives alkaline batteries, which keep providing a constant voltage to the mobile telephone for normal operation as the rechargeable battery of the mobile telephone fails.
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