The HP NB801AA has a somewhat bulkier design than the standard battery, but this is a necessity given its additional cells. Unlike the standard battery that which fits inside the battery compartment of the machine, the HP NB801AA actually sticks out from the bottom somewhat. This causes the laptop to be angled toward the user when used on a lap or a surface. It also adds extra weight, weighing around 1 pound. This could be a downside for users who prefer portability and lightness, especially when traveling, but the benefit of extra battery life will likely outweigh the extra bulk for those who don’t have access to power outlets.

Purchasing the HP NB801AA is an excellent option for almost any user, as it offers the best of both worlds. When portability is a priority and power outlets are readily available, users can opt for the standard 6-cell battery. When extra capacity is needed, users can use the 9-cell model, or even use both batteries, swapping when one gets low. The combination of the two batteries should provide enough battery life for almost an entire work day.

The HP NB801AA is a very worthwhile upgrade for an excellent laptop. Buyers who need more power to get through a long flight or getting work done outside the office will not regret the purchase, and its extra bulk is a worthwhile tradeoff for its benefits.

The HP AT908AA has a power consumption rating of 93Wh. It measures 2 cm by 7.5 cm by 20.5 cm and weighs .48 kg. It is compatible with a wide range of HP laptops, but is mainly designed for the ProBook and EliteBook series. It is one of many options to consider when wishing to extend the battery life of these laptops.

Most of the laptops in these series include a standard 6-cell battery, which fits snugly in the battery compartment of the laptop. Users who wish to upgrade can choose a large 12-cell ultra-capacity battery that will add significantly to the battery life, but also adds a lot of extra bulk, making the laptop much less portable, as it will generally have to be used on a desk or table. Another option is HP’s extended life battery which can be used in addition to the standard battery. This model also adds bulk to the laptop, however.

The HP AT908AA, on the other hand, is larger than the original battery, offering up to 8-10 hours of battery life, but only adding a little extra bulk and weight, as it fits into the existing battery compartment while sticking out slightly farther than the standard battery. This makes it a good compromise for extra battery life while maintaining portability and not significantly altering the shape and usability of the laptop.

For buyers who want great battery life without the extra bulk of other offerings, the HP AT908AA is a great choice. Its relatively low price will help a user get through an entire work day without adding extra weight to a laptop bag.

The laptop comes standard with some features made to work with your battery to improve its life, and your control over your machine’s power functions. HP Power Assistant allows the user to monitor their system’s power consumption and needs, and adjust settings to conserve power and stretch battery life.

The 8440 has available HP Long Life, Ultra-Capacity, and Extended Life batteries. The HP Ultra Capacity battery can provide up to a staggering twenty four hours of battery life when properly configured. The Ultra Capacity battery itself is a 12-cell lithium ion battery with a separate DC jack, meaning you can charge the battery separately from the rest of your machine. It provides 10 hours of battery life on its own, however this battery mounts beneath your machine in conjunction with your existing battery. This means that on a full charge, you can use this battery until drained, and then your machine will automatically revert to pulling power from its installed battery.

HP also offers a similar docking Extended Life 8-cell battery which offers up to 6 hours of life on a single charge. While this battery doesn’t offer the superior lasting power of the Ultra Capacity battery, it cuts the weight of your extended battery down by almost half, and offers the convenience of charging while your laptop is docked.

For standard installation batteries, HP offers a 6-cell lithium ion battery capable of 6 hours of battery life as well as a 9-cell lithium ion battery. For those who intend to keep their machines for a long time to come, HP also offers an Extended Life 6-cell lithium ion battery which has an overall lifespan of up to three years, twice the typical staying power of a laptop battery.

When looking to replace the battery on an HP laptop, you’ll first want to locate your model number. If you flip the laptop upside down, there is a white sticker that lists pertinent information to the build of your machine. Here you will find the exact number of your product, for example “HP Compaq 6735s” or “HP Pavilion dv9000t”. Then, beneath your product number, you will see a series of digits and characters listed after “p/n:” Record the numbers here, up to the “#” which denotes the end of the model number. With these, you can search at an online retailer or local shop and find a replacement that is compatible with your machine.

If you are looking for an exact replacement for your battery, or are unable to identify your exact machine, remove the battery from the machine and flip it over. On the underside of the battery will be a white sticker listing the exact part number of the component, which you can then take to a retailer or online store and order an exact replacement for your part.

If you are ordering a battery for a backup, be sure to store the battery charged at 40% capacity in a cool, dry place between zero and sixty degrees Celsius, or 32 and 140 degrees Fahrenheit. Also, switch your main battery and secondary battery periodically to make sure both remain in working order for years to come.

Dell laptop batteries are made with Lithium-ion technology, in 6-, 9-, and 12-cell formats. Lithium-Ion batteries are light-weight, have high charge-capacity, and require minimal “Conditioning” procedures. It is immensely important to condition Lithium-ion batteries for Dell laptops, every two to three weeks. This can prevent the battery life from depleting, and maximizes the replacement Dell battery’s performance.

If replacement laptop batteries go without routine conditioning, it can result in significantly a shorter battery life. Failure to use the proper AC adapter, with Dell laptop batteries, can also be hazardous. It can potentially create permanent damage to the battery, notebook, or both units. The battery can become dependent on the charger in order to function, and fail to retain any amount of battery life. Using the proper AC adapter helps to ensure optimal performance of the replacement battery for Dell devices.

Dell laptop batteries are CE Certified, through third party test laboratories and certification bodies. The CE seal of approval, certifies that the battery replacements for Dell notebooks have met EU consumer safety, health, and environmental requirements. The CE marking is mandatory on all products sold within the 27 countries of the EU, as well as with all countries that are members of the European Economic Area (EEA).

Since laptop computer batteries are rechargeable batteries, they also undergo a self-discharge when unused for extended amounts of time. Often, new laptop batteries are equipped with internal microprocessor circuits, that optimize the management of battery energy. These batteries are called “Smart Batteries” and also set the charger to the correct charge algorithm, predict running time, and provide a state-of-charge (SoC) indication. There are three primary forms of laptop computer batteries, Nickel Cadmium (NiCd), Nickel Metal Hydride (NiMH), and Lithium Ion (LiON).

NiCd notebook batteries were the first rechargeable batteries ever manufactured for laptop computers, and were relatively inexpensive, with high outputs. NiMH batteries were then released, and can still be seen on various laptop notebooks. They easily surpassed NiCd laptop batteries in reliability, cost, safety and capacity. The recently developed LiON batteries have become the most popular with today’s manufacturers, and are much lighter in weight than its predecessors.

To maintain optimal performance with laptop computer batteries, it is important to make sure that the  metal connecters are cleaned and free from damage. Also, avoid leaving the device powered-on overnight while charging. The laptop should be turned off occasionally, and it can be damaging to the notebook’s battery, to be continuously charging while powered on. When the device is shut down and powered-off, it is suggested to connect the power cable, to keep the internal battery cells moving at all times.