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My Lenovo laptop comes with a nice bit of management software that handles this automatically. When it is at 98% or so when I plug it in, it will switch to mains power, but won't charge the battery.
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Nearly all laptops are doing that (i've seen that on all laptops i've had, namely Fujitsu Lifebook, Sharp Widenote, Thinkpad, Kohjinsha and our local Averatec-like brand).
The difference is that you can see and change these limits in ThinkVantage Power Manager, but can not on most other (non-thinkpad) laptops.