Just want to add some notes for point number one. We have to make sure that we have a stable electric current. Because unstable electric current would harm your inner hardware, especially your hard disk.
1) Date of Manufacturing The manufacturing date is the most telling sign if you should buy a particular laptop battery or not. The basic principle for the battery’s manufacturing date is this: the earlier the date, the better the storage power. If you were to choose between a 2 year old – battery between a battery that was manufactured a month ago, there is certainly no contest – you choose the newly made battery. 2) Always Choose a Branded Battery Laptop batteries are one of those electronics devices that you should buy as an original. Do not ever buy imitations or China-grade batteries because they do not only work well, they can also pose damage for your laptop! They might irregularly distribute electricity to your laptop, making it function poorly, and on a worst case scenario, your laptop will probably melt. Better yet, choose a battery that is the same as the brand of your laptop to be sure it is compatible. 3) Never Fall Below 10% Do not ever let your battery capacity fall over 10%. This can seriously damage your battery and can lose at most 20% capacity in one swoop. When your battery levels come to 20, 15%, always turn it off immediately or put it too sleep. 4) Unplugging Consistently While plugging your laptop at all times isn’t necessarily a bad thing (in fact it is a great thing to do), the battery should also do its job and discharge some of its energy so that it is continually cooled down, so unplug from time to time. more instruction about laptop battery : cbattery.net
I never have my adapter pluggd in except when the battery is finnished, thats helped my batterytime alot.
In my opinion, Dell and Toshiba is the best. Because they have great superiority than others in performance.http://www.cbattery.net