Memory content lost when the battery runs down

My computer sometimes saves memory content when the battery runs down, as it is supposed to, so that when it restarts it is restored to the state it was in,  but at other times it does not.
Is there a way to find out why this is and fix it?

Thanks for the reply.
Doesn't Apple recommend that you do exercise the battery by using its full capacity? They even recommend running it down from full until the computer saves the contents of memory to the special file, then leaving it 5 hours before charging fully again.
I have never heard of the 20% threshold before.
The odd behaviour in my case is that the computer sometimes does what is should: saves the memory then shuts down and when started restores that data, but at others does not save the data first, and starts up normally when I plug in the power and switch on.

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