Advice on batteries please


Standard Member
The battery on my Nokia 3310 has given up the ghost. I've ordered another online but there are some points I have never been clear on:
1. I know a battery will last longer if you let it go flat before charging, but how can you do this when it might go completely flat just when it is needed? Surely, you need to keep it topped up.
2. I've read the term 'memory retention' many times but never known what it means. Can anyone explain it to me?

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