楼里一堆傻逼，737客机给黑匣子，看好了，是黑匣子，起飞后黑匣子提供电源的是发动机机，只要发动机转就一直有电，也可以使用APU，但APU不是一直开着的，一般在低于5000尺就关了，如果发动机全部失灵，737手册上有步骤重新打开APU，黑匣子上有电池，但电池仅供发射信号，就是飞机坠毁向外发射信号，好尽快找到黑匣子，这个电池不是用来给黑匣子记录信息的，不过看不懂中文的人说了也白说，毕竟进牢里踩缝纫机的文盲居多

A cockpit voice recorder (CVR) power supply, also known as a Recorder Independent Power Supply (RIPS), provides backup power for CVRs in the event of a loss of aircraft power. RIPSs are required by the Federal Aviation Administration (FAA) for aircraft with 10 or more passengers.
How it works
RIPSs automatically engage when aircraft power is lost, ensuring that audio recording continues
RIPSs provide 10 minutes of backup power
RIPSs are designed to protect flight data for emergency and routine evaluations
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傻逼，牢里踩缝纫机的文盲，看得懂吗？
用脚趾甲盖想想CVR这种重要设备也会有额外的电池供电，包括冗余电池。
装得好像个行业人士，其实对最起码的灾备设计常识