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AM1808B关于RTC电源功耗大的问题

Other Parts Discussed in Thread: AM1808

你好,我在使用AM1808RTC后备电源供电的时候,发现电池耗电很快,采用的电池是松下CR1220,理论容量为38MA,安装之前测试电池电压为3.24V,安装后经过不到一个月,电池电量就用完了,而之前使用三星S3C2440的时候,经过半年后,电压还剩下2.85V,请问是什么问题,