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Lithium batteries have a fixed lifespan and you can definitely expect a loss of capacity after 3 years of constant use. If 1wk of life is too little for you, then yes, you should change the battery, though make sure you get one that hasn't been sitting on a shelf for a while, these things degrade from the day they're produced.
As far as charging goes, LI batteries are very flexible and the only thing you need to be careful of is not to discharge it all the way down (can do that once or twice to calibrate the battery indicator, but not regularly). If you're not going to be using it for a while, be sure to give it a charge beforehand so it doesn't drain to empty through self-discharge (ideally they should be stored at around 40% charge).
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