my batteries blog

Using a laptop now more and more people, as a notebook, one of the main components of lithium batteries emerging issues also will be increased. So how should make good use of notebook lithium batteries? » Mainly grasp two things:

1. To the appropriate current-discharge.

2. Minimize the discharge less than the over-charging or discharge.

Although the battery is a consumable, lithium-ion battery is no exception. But no one wants the battery to the fine spirit of God, to the age should not clicks on the finished, no one wants to own a battery start Bansi not pull the living, has been on 23 such Ceng, good people Experience is the chicken ribs matter how you say it is »

Well, Yanguizhengzhuan, below the battery began to speak. The first note, only lithium-ion battery. Current appropriate to charge and discharge

General literature and the state on lithium-ion batteries on the standards that the lithium-ion battery should be in charge current 0.2 C to 1 C between. This is the battery capacity that the charge current, such as your battery is 4 AH, then the charge current 0.2 C is 0.2 X4 = 0.8A, that is the charge current 0.8 should be between 4 A. In general, in charge current extent permitted by the smaller the better, lithium-ion batteries for the initial stage should be constant current charging, in my IBMR31, this current is about 2.8 A, equivalent to 0.7 C, is charging its control circuit And can not be your own. Although such a charge has not exceeded the standard indicators, but they do more, especially when the use of battery capacity decline after a period of time, the charge current may exceed 1 C. Charging time now notebook users regardless of the length has become the target of the forced manufacturers to charge current set so high.

So the first step is to reduce the charge current. I have friends in the laboratory work, all furnished, in a trial to him. Power output in the first on a string try resistance, the current is reduced, but became intermittent charging, this is not a good thing. After repeated tests, 4 Ohm is a more ideal value, this time the charge current is about 0.8 A, very stable. This is only the power flows through the interface of the current machines, battery on the charge current estimated to be larger, it should be slightly larger than the 0.2 C. Specific to a different machine, this value may be different. With the addition of the battery voltage increase, the charge current will be reduced, but the decrease rate is very small, less than 0.05 A. In such a charged state, charging circuit seems to be non-functional, battery indicator light is not bright. Such as the battery voltage up to 12.6 V, charging circuit came into play, the battery into the trickle charge, and this time whether the series resistance has been insignificant, the charge current is controlled by the charging circuit, the last full automatic charging circuit after the end of charge. The charging time is about 5.5 hours, if not resistance, charging time is approximately 3.5 hours.

Lithium-ion batteries are Jiaogui, good charge control circuit is necessary. In this charging method, can reduce the charge current, extended battery life, while use of the books the original charge control circuit charge, and it is also relatively simple, just to buy a plug (that is from the power plug into the books The kind, the best buy two, the latter referred to in one way, to good quality) and a resistance can be, the attention of the resistance to the head, after all, are above about 2 W power consumption Otherwise, resistance would be more heat, the best use of their constant resistance to make a silk, silk such resistance and temperature for the resistance has nothing to do. But the shortcomings of this approach is also very clear, that is not in charge of working with books. In addition there will be time charge of a strange phenomenon, I omitted to write here, you try to know, Fortunately, this phenomenon into the trickle charge after the state lost. Charging time extension is not a big problem, since before the beginning of charge to sleep at night, woke up the next day on the charge of the good, of course, if you are sleeping Ye Maozai or special short time, different matter.

Small current charging issue is resolved, now turn to discharge a problem. In fact, it is very difficult, after all, the book is designed to work, work with the discharge current will differ by state, the method mentioned here only to be devoted to restoring the operation of the battery capacity.

Activated machines, power management settings in the state will never go to sleep (standby) and dormant (hibernate), are set to most other power-saving modes, including CPU speed, closing hard drive, display, and so close, and in the process of TP management Do not have to close some of the hardware, such as sound cards, etc., and open the battery status display window, so running in the future! ! ! Close other procedures, in particular a screen saver and other regular operating procedures! ! Do not use machines, do not close the lid, let the battery discharge end (not to discharge the minimum value set to 0, I set up the 3 per cent). Monitor and hard drive off after the discharge current is about 0.5 A, this is my IBMR31 to be able to achieve the minimum discharge current, battery discharge to set the minimum value after the machine will automatically shut down. The discharge time lasted about more than four hours, according to your different battery capacity may vary, the time is also sleeping with the means to kill.

Well, finally stressed that the above approach is not dead, especially the discharge, there are 10 times can do so once, or else to battery doing » Charging the best use the small current charge, of course, if the need batteries, plug directly into the book on it.

I used this method of battery, now put a charge of 14, capacity has remained at over 45, and battery design capacity is 43.2, which have decreased the time, but this charge after the all-time restored.

Beginning stresses two points, First, the appropriate charge and discharge, and second, not to discharge less than the charge, the following discharge look at how to solve the problem of insufficient charge on it: to minimize discharge less than the over-charging or discharge

In fact, the excessive discharge solved, not to terminate the discharge limits can be set at too low a level, I have been using three percent.

Very often just do not use batteries may be a long time, such as the battery remaining 70 percent, if the switch to power, then the battery is automatically charged, such a cycle would be no, although battery life is not absolutely determined to cycles of death, But always it will reduce battery capacity, lithium-ion battery said to no memory effect, but in fact only relatively low-only memory effect. Unfortunately, IBM did not provide solutions to discharge less than the charging method, but provided the basis to solve this problem. This is what I found on the R31, may not necessarily suited to other machines, but methods should also be close, do not forget after you tried to paste up the share.

R31 charging circuit in accordance with the power to decide whether or not the state of batteries. Power output voltage is 16 V, error of plus or minus 0.2 V, if the voltage is lower than 15.5 V, then charging circuit not to charge the battery, and books can work, which is IBM provided the basis to solve the problem. However, the foundation is weak, because if the voltage lower than the 15.2 V, books will be converted to use battery-powered, even if the power planted on the books is also useless. In other words, we can disruption of the space is 0.3 V.

If you can find a 15.5 V, over the current 3 A switching power supply, then the issue was resolved, otherwise continue to Read.

The power to reduce the 0.5 V output voltage is not an easy thing, the series resistance does not work, because of resistance on the voltage will change with the current size. I use the silicon rectifying diodes, through the current request to allow in more than 2 A, or tube is too hot. Silicon Rectifier diode forward voltage drop of 0.7到0.5 V, and just to meet the requirements. Now such tubes in the electronic market Duo Deshi, the price of less than two yuan. To a different book on the specific situation may be different, the best-on-hand for the installation of a digital multimeter Cece. The tubes are positive in the series connection of power output, and then followed by a buy their own power plugs inserted on the book. It does not matter to the anti-diode, the book does not work to critize, and then in turn connected to it.

In this way, the power output voltage drop of around 0.5 V, if the decline too much, the book will switch to battery life, if dropped too low, the book will charge the battery, the specific number to you in his book on the experience to know.

Of course, if your battery has been full of this circuit there is no need, you can use it, directly to the power output to the books on it.

Here, mentioned at the beginning of the two issues are resolved. Now you see the results of the test, it is estimated that in the book on the different results might be different, their best try to ride a circuit, so spent 10 wronged money

Finally I wish you good luck! You make good use of the lithium batteries! Reminded:

Plug in the modification of the most common mistake is easy to engage in anti-polarity (diodes engage in anti-polarity does not matter), so you must double-check with multimeter measurement, and use different colors of the wires are connected negative. I do not know engage in anti-polarity power will burn the books, not tried.

Tags: Notebook //