Not at all. It does a good job of keeping track of battery life and wear.
For example, after having my laptop for awhile, it detected my wear at ~4% (in other words, I have a 4% reduction in max capacity since the battery has had some use). One day, my laptop powered up while in my backpack and wound up cooking in there and completely draining the battery, which is bad for lithium ion battery packs.
Battery Bar is now showing the wear at ~7% from being run down and heated up so much. And it's consistent enough where it reads the same amount of wear after a couple of formats and Windows reinstalls.
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