laptop battery

Most people leave the AC adapter plugged into their laptop Sony PCGA-BP2NY battery and the battery installed. This is not good, for several reasons.

While you might think a laptop should bypass the battery if the AC adapter is connected, in most cases that is not what happens. Instead, the laptop drains some of the energy from the battery, which is then immediately recharged from the AC source. This means that the battery is constantly discharging and recharging (also known as "thrashing"). Since the battery has a finite number of charging cycles, this can lead to premature failure of the battery. Worse, the constant charging means that the battery gets very hot, and that heat can be transferred to the system board, which helps eventually cause general failure Sony PCGA-BP2NX battery of the laptop.

So, what to do? If you are using the laptop in a stationary position, with the AC adapter constantly connected, you can remove the battery from the laptop (when it is powered off and unplugged). This will avoid the problems of discharging/recharging and heat. When you need to use the laptop without the AC adapter, then plug in the battery. If you don't use the battery for a month (or use it sparingly), then unplug the AC adapter, reinsert the battery, and turn on the laptop Sony PCGA-BP1N battery (but don't plug in the AC adapter); when the warning appears that the battery is almost out of charge, then turn off the computer, plug in the AC adapter, and let the battery fully recharge (time to recharge depends on the battery, check with the manufacturer). Once the battery has fully recharged, you can again remove it from the laptop (if you're planning on running from the AC adapter).

A word of caution: obviously, if you lose AC power, your laptop (without installed battery) will suddenly turn off, much like a desktop -- so it would be a good idea to have the AC adapter plugged into the battery side of a UPS when you're running without the laptop's battery.

With proper care, a laptop battery might surpass the average 3-year lifespan.
Rule #1: NEVER EVER EVER discharge the battery Sony laptop battery to below 20% capacity. Lithium ion batteries will be put under extreme stress with every deep discharge. If you keep the battery at 0% charge for a few months, a copper shunt will actually form in the battery and when you try to charge it the shunt acts as a short circuit and the battery will catch fire. Nickel Cadmium batteries are the ones that love to be deep-discharged every time; but even modern Nickel Metal Hydride cells are worn out by repeated deep discharges... lithium ion batteries are even more sensitive to deep discharge, so set your computer to give you a battery warning at 20%, and switch the laptop off!

Rule #2: If you're not going to be using the battery, charge it to exactly 40%, take it out of the laptop and store it somewhere cold. Do not leave the battery at 100% charge needlessly, because the wear process is accelerated at 100% charge and is significantly slower at low temperatures and 40% charge. Look at the table on this page: http://batteryuniversity.com/parttwo-34.htm

When you do eventually need to use the battery (before a road trip or when you're travelling), just pop it into the laptop Hp PB991A battery and charge it.

Rule #3: After around 2-4 years, the battery will die no matter what you do to it. This is because (especially in cobalt-based batteries) the cobalt used to connect the contacts to the cell internally is slowly dissolved over time by the electrolyte of the battery; essentially the battery is self-destructing on an ongoing basis. The process starts the second the battery leaves the production line, so it would be wise to look at the date of manufacture printed on the battery and AVOID OLD STOCK!

Oh, and it helps if you give the battery gentle discharges i.e. use the battery for word processing and browsing the internet... try to avoid playing games or other power-hungry applications while on battery, because the high current needed to run those applications causes the battery Hp PB994A battery to heat up and also wears out the battery a little faster due to the fast rate of chemical reaction needed to sustain that high current.