Question:Most of the time i use my laptop on electric power and dont use the battery.However sometimes i switch the laptop off and forget to switch off the charger switch.And as my battery is already charged it dosent need to be left on.So is it okay to keep the charger on when laptop is off and apple A1078 battery is full or does it cause any damage to the charger or the battery?

  Answer:Most laptops use lithium ion batteries that have a very sophisticated charging system. As such you cannot over charge your battery (like you can with simple/older Nicad chargers) in addition lithium ion batteries do not suffer from the memory effect associated with some other type of battery

However, lithium ion batteries will not last as long if you keep them fully charged all the time. They store best at around 50% charge and will last longer if you cause electrons to flow on a regular basis. This means using them fairly regularly.

In any case, no matter what you do you will find that the hp Pavilion DV1000 battery gradually loses its ability to hold a charge. In most cases a lithium ion battery will need replacing after a about two years as it will only hold a small fraction of its original capacity after this time.