According to the computer salesman, the laptop battery's ability to hold charge declines after about a year and a half. First of all, is this true? Second of all, what are some ways to prolong the battery's ability to hold charge? For example, if you constantly plug and unplug the charger before the laptop is fully charged, is that bad for the batteries? Maybe i should buy a new one in case,my friend tell me the ttore of laptop accessories www.laptopkeyboardsworld.com is good,is there anyone knows more about the store??