Have you ever desoldered one of those ancient RTC modules from an equally ancient PC mainboard?
There was a time in the 1990s where board manufacturers abandoned the old leaky NiCd buffering cells and instead of hopping onto the CR2032 lithium train. They used Dallas modules (back when Dallas was still Dallas and not Maxim…which also ceased to exist in 2021 when they were bought by Analog) that served as real time clocks and battery backed SRAM for some 100 bytes of BIOS settings.
Well yeah, these are terrible as the battery isn’t replaceable since it is moulded into the bulky case. […]