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Hi David,
Your mileage will vary greatly depending on the type of battery and how you use it. My darling wife can destroy a good quality lithium battery within a few months, whereas I will get around 2 years of hard use out of mine.
From what I've been told, your lithium lappy battery loves to be stored around the 70% mark and doesn't like being on charge permanently. If you can fully charge up before use and avoid discharging much below the 50% mark you'll get loads of life out of them.
My personal experiences with lithium batteries supports the advice I was given. I'm writing this on a 2 year old lappy that still gives me 6+hrs on battery and both my mobiles are over 2 years old with good battery life.
I've also spent several thousand on replacement batteries for my cordless tools over the years and mange to get excellent service life on them these days.
HTH.
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