HP's "advice" was a little light on actual advice, and the calibration information is out of date.
For the most part, I would just say don't worry about it. Batteries are consumables, and no matter what you do, they will eventually stop working. So I always tell people that it is not worth developing an obsessive compulsive disorder over, just use the battery when you are not around an outlet or want the freedom from the AC adapter, use AC power when it's convenient/necessary, and don't really worry about it otherwise.
You have a Lithium Ion (Li Ion) battery, so it does NOT suffer from memory like some may claim. The average service life of a Li Ion battery is about 300 cycles before it is consumed. That is true for laptops, cell phones, handheld game consoles, and anything else using a Li Ion battery. A cycle is defined as the battery going from 100% charge down to 0%, and this can be done just about any unique combination you like. A very simple example would be to say you start out with 100% charge, run it down to 50%, charge it back up, and then go back down to 50% again. That would be one cycle. As the battery ages, the chemicals used to store the electrical charge will break down and the battery will gradually lose capacity. When this happens the battery is considered to be consumed. Once a battery is consumed, its performance typically drops off very quickly, and this is normal. Once a battery is consumed, it is best to replace it as quickly as you can, or simply remove it from the unit and take it somewhere for proper disposal. Failure to do so will eventually result in the battery swelling and causing damage to the cosmetics of your laptop, possibly even damaging the electronics. If you still do not act, eventually the battery will explode. However, before you get too worked up, the process from consumed to swelling usually takes a good couple of months, and from swelling to exploding is a couple more months past that. So you will really have no one but yourself to blame if it gets that far.
On the average, a battery should last approximately 2 years, however that is an average. Some will last longer, others will die sooner. Same as the number of cycles a battery will last. I have seen batteries consumed in the high 200 cycles and batteries that have made it over 500 cycles and are still going strong. The 300 cycles is merely an average, not necessarily a sign of a defect if yours does not last that long.
So at the end of the day, I would say that you should spend more time just enjoying your laptop and not obsessing over prolonging the service life of the battery.