Tell me please, should I remove the hp compaq nc6400 battery if the notebook is on AC mainly and just about once or twice a week on battery power?

And some other essential questions:

1) As I know, full discharge of Li-Ion battery is harmful for it – so I think that 3% charge shown by Windows or HP laptop Battery check is about 20% of real, physical charge-so full discharge is impossible- am I right?

2) When I turning my notebook off for the night time, I unplug the hp compaq nc6400 charger off the AC too – is it right?

3) So, when the notebook is off or hibernated it shouldn’t consume any power, but when I turn on the notebook after night – the charge level is not full – (I guess that that it’s a normal physical process somthing like internal resistance or else) – but when the AC is back, the battery begins charging – so if this miserable charge counts by the hp nc6400 battery controller as a new lifetime charging cycle or not?

4) Maybe it is more reasonable to keep the notebook always on AC without removing the battery and the controller will switch the charging device off when the battery doesn’t need any more of charge? But wouldn’t it decrease the battery’s total capability faster?

5)Is it important – how many percent charge left in laptop battery when I begin charging it? Or I should discharge it by the time the notebook switches off and can’t start?

Maximum compaq nc6400 battery life results from keeping it cool – and at below 50% charge when not in use. When it’s in the laptop, it should chage to 100% and may remain warm after charging as a result of heat from the machine itself. So the answer is yes – except that if you need to use it on battery power a couple of times a week, you’ll need to remember to reinsert it to get it fully charged before relying on battery power.

1) The battery will automatically stop itself from discharging at a “safe” voltage.

Full discharge is not impossible – it will happen but very slowly over time if the hp compaq nx6110 battery is stored – due to natural discharge internal chemical reaction and the fact that it is powering its internal electronics

2)Unplugging the ac adaptor is fine as a safety measure, (possible fire or night-time lightning strikes to the power cables) but is not otherwise necessary . If you don’t have a battery fitted, then auto wake-up (eg for incoming fax) won’t of course be available

3. Yes – there is small power consumption on hibernate, from the battery if ac power is unavailable. It’s still connected to the power arbitration circuitry. But the small recharge does not to my knowledge count towards the lifetime cycle count.

4. Personally, I think the fact that the hp 6710B battery is held in a full state of charge and kept warm will have a greater effect on its life.

5. A properly working battery will measure input and output watts, keeping track or and reporting its charge state. With many short and shallow discharge cycles, its knowledge of its charge state will drift from reality but will otherwise not do any harm. A discharge to 5% or less while working normally follwed by a full recharge should recalibrate the hp compaq nx6325 battery . There is no need to discharge to the switch-off and can’t restart stage, although the deeper the discharge, the more accurate should be the calibration.

Having said all of that, it only takes one cell to fail – or a problem in the battery’s internal control system – for the battery to fail completely – and one of these events is more probable than an end of life on cycle count. Consequently, in your position of needing battery power a couple of times a week, I wouldn’t bother taking it out at all – unless your machine keeps it unduly warm.

Evaluating Environment and Process Description:

PConline evaluation room will usually receive two types of notebook computers: engineering prototypes and sales prototype. Engineering prototypes are usually not formally listed on the product, configuration, etc. are all products sold there and the formal differences between test scores for reference only, can not serve as the contrast between the machine used. Prototype, while the sales of products on the market in line with the results compared with the value. We have reviewed the article in the preamble will give a detailed description of the measured product prototypes or sales engineering prototype (under normal circumstances there is no mention of the words were selling prototype).

In order to unify the software platform, while adapting to the current tide of the mainstream operating system, notebook tests using the latest Windows Vista Ultimate SP1 English (in the past is the use of Windows XP Professional SP2 English version), with the same test platform DIY accessories. Here a question arises, if it is selling prototypes, then most likely destroyed the hard drive information, such as pre-installed operating systems and backup information, etc., so evaluation engineers, but also should first dismantle the hard disk out of the entire hard drive to do Ghost image backup , complete re-evaluation after full recovery (so it is still engineering sample of the more popular evaluation engineer). In addition, in order to simulate the use of laptop computer users real-time environment, the laptop will be sent to test all the hardware drivers installed, install the relevant software vendor’s unique, of course, when necessary, will be marked with all the software and driver patches .

Related: Sony VGP-BPS8 battery, Dell Inspiron 1525 Battery, Dell Studio 1535 battery, Dell Inspiron 6400 Battery

Laptop Lithium Ion batteries are very expensive (quite a few of them are over (WAY over, in a few cases) $200).  They CAN last 10 years (in fact I have some 1995 Toshiba batteries that are still nearly as good as new), but they can also be destroyed in less than 6 months. As an engineer who has both worked for laptop manufacturers and who services laptops, here is what I can tell you:

The most important rule of getting good life from a battery is this: If you are not traveling, if you are stationary and are going to be plugged into a wall outlet for a day or two or perhaps essentially all of the time, take the battery out of the computer entirely and store it in a cool, dry place (some people will recommend a refrigerator, but that is not necessary, will probably not make a difference that you will really notice, and can damage the battery if the temperature gets too cold (freezing)).

It’s not clear why this is necessary, and on some models it may not be necessary (your post, however, suggests that it IS necessary on your model). However, there is OVERWHELMING annecdotal evidence that this is the single most important thing that you can do to have your battery last years and years, for the times when you really do need it, when you are traveling and want to use the laptop in a car, on a plane or in various transient locations.

The two likely culprits here are overcharging and heat.

While in theory the charging circuits should shut down [COMPLETELY] when the battery is fully charged, there is evidence that in many laptops they don’t; they continue charging the battery continuously , albeit in a “trickle charge” mode. This may sound good, but in practice it can damage the battery.

Secondly, it is a well known fact that Lithium Ion batteries are terribly sensitive to permanent damage by exposure to elevated temperatures (and “elevated” in this case starts in the range of around or just over 100 degrees F (about 40C)).

With regard to elevated temperatures, storage in a turned-on laptop is problematic for two reasons. First, there is a lot of heat in the laptop (from the various laptop components: CPU, hard drive, power supply, etc.), and the battery is, to varying degrees, exposed to this heat (note, however, that battery exposure to this heat varies by model depending on the thermal design and placement of the battery relative to other heat generating components). Secondly, if the charging circuits do not shut down COMPLETELY, charging itself (even “trickle charging”) generates heat from directly within the battery itself which is harmful over time.

Now, a few more comments:

First, it’s probably not a good idea to remove the battery while you are staying in a hotel for a few days, even if you won’t need it. The risk of forgetting the battery in the hotel room when you check out is significant (you can mitigate this by leaving the battery in your laptop bag, but ask anyone who uses PC Cards about “lost dongle cables”).

Second, notwithstanding the general advice to remove a battery that is not needed and not being used, the battery needs to be exercised 2 to 4 times a year. So, once in a while, put it back in the laptop, draw it down to about 25% (NO LOWER!!) and then charge it back up to about 60% (or 100% and then back down to 60%; Lithium batteries store better with a less than full charge although in my personal experience I have not found the difference to really matter very much).

Third, if your laptop is really used as a compact desktop at home or at work and in fact doesn’t travel much, removing the battery robs you of it’s function as a “UPS”. Solution: Buy a [real] UPS. For a laptop, you only need a small one (300 to 350VA), these can be found for $40 or less (sometimes even “free after rebate”), and a UPS is a lot cheaper than using a $200+ lithium battery as a UPS but destroying it over a period of 6 to 24 months in the process.

Also note that Lithium batteries have a finite and limited life in terms of the number of charge/discharge cycles, calendar time not withstanding. Although this varies by battery model, it’s in the low-to-mid hundreds (say 300 to 600 cycles as a typical range). If you really are using your battery while traveling, charging and discharging it on a daily basis, this fact will “get you” no matter what you do. But, more commonly, people find that they have destroyed their battery without ever really using it, by leaving it in the laptop while the laptop was plugged in continuously. And we have already covered the solution to that problem.

One last comment, given the price of laptop batteries, it’s worth noting that SOME extended warranties cover the batteries. If you are really going to be using the battery heavily (see the previous paragraph), this may be worth taking into consideration when the colored shirt guy at Buy More offers you an extended warranty at the time of the laptop purchase. Find out (IN WRITING!!) if the battery is covered, and if your use pattern is such that you will probably be going through more than the initial battery over the course of the extended warranty, maybe you are in one of those situations in which an extended warranty really does make sense.

by Watzman – forums.cnet.com

Related:  HP Pavilion DV6000 battery   HP Pavilion DV9000 battery   Dell Xps M1210 battery

With the current offensive is very strong in the best selling models of  Dell Inspiron 1525  laptop, Dell Latitude D620 , for example. Trial was fair results.

1. Shutdown, the battery is full.

2. The unplugged, the battery consumption to 98%, a power grab, the bottom right of the icon displays 100% of capacity.

3. The unplugged, the battery consumption to 96%, plug the power supply, the lower right corner of the icon displays 100% of capacity.

4. Unplug the power, the battery consumption to 95%, plug the power supply, icons bottom right corner has changed now shown that “95% of the supply (power supply has been connected and is charging). ”

5. This may confirm that the Toshiba L526 laptop model system automatically charge 95% power lines. Does this mean that this series of Toshiba notebooks, the Toshiba L510 series is the type of battery. Dell Inspiron 6400 battery Acer Aspire 3680 battery

6. Similarly, other brands of computers can be tested in the same way.

The above method may be a good test computer with a charging cable, so you can make using a laptop and disconnected the battery as if they feel troubled by the readers of this based on evidence of answer the question.

If the reader used in laptop batteries follow the above rules, so no need to disconnect the battery, the laptop gives you the enjoyment of pleasure, that is, there are no vacancies right look, do not fear not the threat of a sudden power failure, the benefits of the performance of this laptop so incisive and striking.

5% of electricity consumption needs 1-2 weeks, which recharges the battery, will be 1-2 weeks time. This also happens to be in line with the supplier of the charge and discharge twice per month. Of course, not completely discharged each time. It is not important. The impact on Sony VGP-BPS9 battery SONY VGP-BPL8 battery life is not a great legend. Connect the battery used to relax with energy. Do not shoot the 10 million batteries a beautiful parade, the greatest care of the battery, the battery is properly better, while the computer is broken (like a sudden power outage damage hard disk) it is really just not worth it. Yes!

Purchase of laptops is to use and not lose its value.

Like clothing you must wear uniforms all day to reflect its value lies, do not wear every day to enjoy the hanging, it is meaningless.

The same people, to break a go, know their value, but the day nest at home, do not touch the Community to realize their own value, then you are worthless.

To use the laptop is not bad. Believe in yourself, trust your Acer Aspire 3810T laptop.

Of course, these rules do not satisfy the laptop battery is to connect the power supply, when the battery is connected, this time the battery in 1% of electricity, the system immediately to its 1% fee then disconnect the bar. However, in today’s notebook computers and accessories related to the technological maturity of the situation, this does not appear in the new models. For now still use the old notebook drives stressing that the quality of the portable player is very good, but do not worry. Therefore, this paragraph makes no sense. Reference for comparison only.

Other mobile phone brands do not test, hope that this test method can help those who have disconnected the battery to worry about whether readers.

Dell xps m1530 battery – 9 Cells 7200mAh Battery for DELL XPS M1530 TK330 RU006

Capacity: 7200mAh/9-Cell
Product Type: Replacement
Battery Type: Lithium ion
Chemistry: Li-ion
Volts : 11.1V
Capacity : 7200mAh 9-cell
Function: Powerful, Overcharge and overheat protection
Color: Black
shop link: http://www.discountbatteryshop.co.uk/dell-xps-m1530-battery.html

Rechargeable dell XPS M1530 battery description:
Dell XPS M1530 Battery is specifically designed for Dell laptop. We offers a complete line of dell batteries and compatible replacements for most laptop models, Our replacement dell XPS M1530 batteries are made with high quality parts and are guaranteed to meet or exceed the original equipment manufacturers specifications at a reduced price. All dell XPS M1530 Battery is tested for 100% quality control assurance. These batteries includes a one year warranty. You can count on our batteries! We offer a 30 day unconditional money back guarante and fast shipping on all of our dell batteries.

Dell XPS M1530 battery Detail:

* New dell XPS M1530 batteries are shipped in a discharged condition and must be charged before use. We generally recommend an overnight charge (approximately twelve hours). Refer to the user’s manual for charging instructions. Rechargeable dell XPS M1530 batteries should be cycled – fully charged and then fully discharged – two to four times initially to allow them to reach their full capacity.
* Try to avoid frequent full discharging of the dell XPS M1530 battery.
* It is normal to get warm when charging or normal use the dell XPS M1530 battery. If it is getting too hot, there may be a problem with the device and qualified personnel should check it.
* If you don’t plan on using the replacement XPS M1530 dell laptop battery for a month or more, we recommend storing it in a clean, dry, cool place away from heat and metal objects.
* To get maximum performance from the XPS M1530 battery, fully optimize the notebooks power management features prior to use. Power management is a trade off: better power conservation in exchange for lesser computer performance. The power management system conserves battery power by setting the processor to run at a slower speed, dimming the screen, spinning down the hard drive when it’s not in use and causing the machine to go into sleep mode when inactive. The notebook users guide will provide information relating to specific power management features.

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There will come a time in the life of my xps m1210 notebook when the battery will have to be replaced.  When this happens, I need to buy a new 9-cell Dell XPS M1210 Battery.

Battery research is focusing heavily on lithium chemistries, so much so that one could presume that all portable devices will be powered with lithium-ion batteries in the future. In many ways, lithium-ion is superior to nickel and lead-based chemistries and the applications for lithium-ion batteries are growing as a result.

Lithium-ion has not yet fully matured and is being improved continuously. New metal and chemical combinations are being tried every six months to increase energy density and prolong service life. The improvements in longevity after each change will not be known for a few years.

A lithium-ion battery provides 300-500 discharge/charge cycles. The Dell XPS M1210 Battery prefers a partial rather than a full discharge. Frequent full discharges should be avoided when possible. Instead, charge the battery more often or use a larger battery. There is no concern of memory when applying unscheduled charges.

Although lithium-ion is memory-free in terms of performance deterioration, batteries with fuel gauges exhibit what engineers refer to as “digital memory”. Here is the reason: Short discharges with subsequent recharges do not provide the periodic calibration needed to synchronize the fuel gauge with the battery’s state-of-charge. A deliberate full discharge and recharge every 30 charges corrects this problem. Letting the battery run down to the cut-off point in the equipment will do this. If ignored, the fuel gauge will become increasingly less accurate. (Read more in ‘Choosing the right battery for portable computing’, Part Two.)

Aging of lithium-ion is an issue that is often ignored. A lithium-ion XPS M1210 Battery in use typically lasts between 2-3 years. The capacity loss manifests itself in increased internal resistance caused by oxidation. Eventually, the cell resistance reaches a point where the pack can no longer deliver the stored energy although the battery may still have ample charge. For this reason, an aged battery can be kept longer in applications that draw low current as opposed to a function that demands heavy loads. Increasing internal resistance with cycle life and age is typical for cobalt-based lithium-ion, a system that is used for cell phones, cameras and laptops because of high energy density. The lower energy dense manganese-based lithium-ion, also known as spinel, maintains the internal resistance through its life but loses capacity due to chemical decompositions. Spinel is primarily used for power tools.

The speed by which lithium-ion ages is governed by temperature and state-of-charge. Figure 1 illustrates the capacity loss as a function of these two parameters.

Figure 1: Permanent capacity loss of lithium-ion as a function of temperature and charge level.
High charge levels and elevated temperatures hasten permanent capacity loss. Improvements in chemistry have increased the storage performance of lithium-ion batteries.

The mentioning of limited service life on lithium-ion has caused concern in the battery industry and I will need to add some clarifications. Let me explain:
If someone asks how long we humans live, we would soon find out that the longevity varies according to life style and living conditions that exist in different countries. Similar conditions exist with the batteries, lithium-ion in particular. Since BatteryUniversity bases its information on the feedback from users as opposed to scientific information derived from a research lab, longevity results may differ from manufacturer’ specifications. Let’s briefly look at the various living conditions of the lithium-ion battery.

The worst condition is keeping a fully charged battery at elevated temperatures, which is the case with running laptop batteries. If used on main power, the battery inside a laptop will only last for 12-18 months. I must hasten to explain that the pack does not die suddenly but begins with reduced run-times.

The voltage level to which the cells are charged also plays an important role to longevity. For safety reasons, most lithium-ion cannot exceed 4.20 volts per cell. While a higher voltage boosts capacity, the disadvantage is lower cycle life. Figure 2 shows the cycle life as a function of charge voltage.

Figure 2: Effects on cycle life at different float charge levels (Choi et al., 2002)
Higher charge voltages boost capacity but lower cycle life.

There are no remedies to restore lithium-ion once worn out. A momentary improvement in performance is noticeable when heating up the battery. This lowers the internal resistance momentarily but the condition reverts back to its former state when the temperature drops. Cold temperature will increase the internal resistance.

If possible, store the battery in a cool place at about a 40% state-of-charge. Some reserve charge is needed to keep the battery and its protection circuit operational during prolonged storage. Avoid keeping the battery at full charge and high temperature. This is the case when placing a cell phone or spare battery in a hot car. Running a laptop computer on the mains has a similar temperature problem. While the battery is kept fully charged, the inside temperature during operation rises to 45°C (113°F).

Removing the battery from the laptop when running on fixed power protects the battery from heat. With the concern of the battery overheating and causing fire, a spokesperson for the U.S. Consumer Product Safety Commission advises to eject the battery of affected laptops and to run the machines on a power cord. It should be noted that on a power outage, unsaved works will be lost.
The question is often asked, should the laptop be disconnected from the main when not in use? Under normal circumstances, it should not matter with lithium-ion. Once the battery is fully charged, no further charge is applied. However, there is always the concern is malfunction of the AC adapter, the laptop or the battery.

A large number of lithium-ion batteries for cell phones are being discarded under the warranty return policy. Some failed batteries are sent to service centers or the manufacturer, where they are refurbished. Studies show that 80%-90% of the returned batteries can be repaired and returned to service.

Some lithium-ion batteries fail due to excessive low discharge. If discharged below 2.5 volts per cell, the internal safety circuit opens and the battery appears dead. A charge with the original charger is no longer possible. Some battery analyzers (Cadex) feature a boost function that reactivates the protection circuit of a failed battery and enables a recharge. However, if the cell voltage has fallen below 1.5V/cell and has remained in that state for a few months, a recharge should be avoided because of safety concerns. To prevent failure, never store the battery fully discharged. Apply some charge before storage, and then charge fully before use.

All personal computers (and some other electronic devices) contain a battery for memory back up. This battery is commonly a small non-rechargeable lithium cell, which provides a small current when the device is turned off. The PC uses the battery to retain certain information when the power is off. These are the BIOS settings, current date and time, as well as resource assignment for Plug and Play systems. Storage does shorten the service life of the backup battery to a few years. Some say 1-2 years. By keeping the computer connected to the main, albeit turned off, a battery on the PC motherboards should be good for 5-7 years. A PC should give the advanced warning when battery gets low. A dead back-up battery will wipe out the volatile memory and erase certain settings. After battery is replaced, the PC should again be operational.

Longevity of high-power lithium-ion
Generally speaking, batteries live longer if treated in a gentle manner. High charge voltages, excessive charge rate and extreme load conditions will have a negative effect and shorten the battery life. This also applies to high current rate lithium-ion batteries.

Not only is it better to charge lithium-ion battery at a slower charge rate, high discharge rates also contribute the extra wear and tear. Figure 3 shows the cycle life as a function of charge and discharge rates. Observe the good laboratory performance if the battery is charged and discharged at 1C. (A 0.5C charge and discharge would further improve this rating.)

Figure 3: Longevity of lithium-ion as a function of charge and discharge rates.

A moderate charge and discharge puts less stress on the battery, resulting in a longer cycle life.

Battery experts agree that the life of lithium-ion depends on other factors than charge and discharge rates. Even though incremental improvements can be achieved with careful use of the battery, our environment and the services required are not always conducive to achieve optimal battery life. The longevity of a battery is often a direct result of the environmental stresses applied.

Simple Guidelines

Avoid frequent full discharges because this puts additional strain on the battery. Several partial discharges with frequent recharges are better for lithium-ion than one deep one. Recharging a partially charged lithium-ion does not cause harm because there is no memory. (In this respect, lithium-ion differs from nickel-based batteries.) Short battery life in a laptop is mainly cause by heat rather than charge / discharge patterns.

Batteries with fuel gauge (laptops) should be calibrated by applying a deliberate full discharge once every 30 charges. Running the pack down in the equipment does this. If ignored, the fuel gauge will become increasingly less accurate and in some cases cut off the device prematurely.

Keep the lithium-ion battery cool. Avoid a hot car. For prolonged storage, keep the battery at a 40% charge level.

Consider removing the battery from a laptop when running on fixed power. (Some laptop manufacturers are concerned about dust and moisture accumulating inside the battery casing.)

Avoid purchasing spare lithium-ion batteries for later use. Observe manufacturing dates. Do not buy old stock, even if sold at clearance prices.

If you have a spare lithium-ion battery, use one to the fullest and keep the other cool by placing it in the refrigerator. Do not freeze the battery. For best results, store the battery at 40% state-of-charge.