That being said, if you’re using a rechargeable lithium battery as a backup power source, make sure you understand the lifespan considerations of the device since most LCO lithium variants have a 3-4 year shelf life before they’re useless - regardless of cycles. Also, a rechargeable lithium battery probably shouldn’t “float” at its highest voltage level while ready to provide backup power. If you let the battery “float” at something closer to 80% SoC (instead of 95-100%), you’ll see a much higher standby life of that battery.
On December 11, 1946 Freddie Williams applied for a patent on his cathode-ray tube (CRT) storing device ( Williams tube ) with 128 40- bit words. It was operational in 1947 and is considered the first practical implementation of random-access memory .  In that year, the first patent applications for magnetic-core memory were filed by Frederick Viehe.   An Wang , Ken Olsen and Jay Forrester also contributed to its development.  The first modern memory cells were introduced in 1965, when John Schmidt designed the first 64-bit MOS p-channel SRAM .  The first bipolar 64-bit SRAM was released by Intel in 1969 with the 3101 Schottky TTL . One year later it released the first DRAM chip, the Intel 1103 that by 1972 beat all worldwide records in semiconductor memory sales.