Can we not simply connect a battery to a RAM to prevent data loss during power cuts?

Published: 10/10/2019
Can we not simply connect a battery to a RAM to prevent data loss during power cuts?
Source: ELECTRONICS.STACKEXCHANGE.COM

So, I was just wondering about how volatile memory storage loses data when the power to them is cut off. But can we not solve that problem by using a battery in conjunction with a RAM and a ROM and when there's a power cut i.e. when the computer didn't receive a shutdown signal the battery kicks in and a controller transfers data from RAM to an EEPROM? EEPROM - because I guess HDDs and SSDs cons

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