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By admin, September 8, 2010 1:09 am

To obtain maximum performance, all chemical materials in the battery must be fully activated. In order to achieve this:

• Cycle the battery (fully charge, then fully discharge) three times.
• Cycling the battery three times is also recommended if you have stored the battery for a few months.
• Do not charge the battery pack until all of its power is used. Partial charge or discharge causes a lack of uniformity of activated chemicals in the cell, and may cause performance degradation.

It is recommended that you deep-discharge your Ni-MH battery every few months for optimum performance. Deep-discharge occurs when your ThinkPad system is used on battery power until the charge is at 0% (the system will automatically go into hibernation). At this point, attach the AC adapter and charge to 100%.

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By admin, September 1, 2010 1:33 am

NOTE: This is for HP Notebook PCs with Windows 7 and Vista.

How long will the battery last?

Users often ask how long should their battery last between charges, or why does one model of computer get better battery performance than another. There is no simple answer. Battery life will vary depending on the product configuration, product model, operating system, applications loaded on the product, power management setting of the product, and the product features used by the customer. For all batteries used in an electronic device, the maximum capacity of the battery will decrease with time and usage.

Power plans

A power plan is a collection of hardware and system settings that manages how your computer uses power. Power plans can help you save energy, maximize system performance, or achieve a balance between the two.

Maximizing the capacity and life span of the battery

It is important to be aware of ways that you can care for the battery in your notebook PC. There are conditions that may reduce battery run time and life span.

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By admin, April 13, 2010 9:08 pm

1) Turn off the “Always-on” mobile data connection.
On the Home screen, select Menu => Settings => Wireless controls => Mobile network settings and turn off “Enable always-on mobile data”. This will make the biggest impact on battery life.

2) Disable Wireless network usage for positioning purposes
To disable this go to Menu => Settings => Location => Use wireless networks. This will turn off the “anonymous” Google location data collection that uses the wireless data connection frequently. Any app that will need a location will turn on the GPS separately. Please note that turning off wireless network usage for location purposes will stop the assistance provided to GPS hence, will take time.

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By admin, December 24, 2009 9:26 pm

1, lead-acid batteries:

a. Lead dioxide electrode self-discharge

(1). Oxygen evolution caused self-discharge (2). Contact with alloy plate caused corrosion, lead dioxide is reduced to form aluminum sulfate (3). Reaction with oxygen (4). impurity effect.

b. Lead electrode self-discharge

Lead electrode self-discharge from the hydrogen and oxygen corrosion, because of the solubility of oxygen in sulfuric acid is small, and can be removed.

Electrolyte solution with high concentration of hydrogen ions, Hydrogen induced apparent self-discharge. Equilibrium electrode potential of lead is smaller than hydrogen, but due to lead in the high overpotential of hydrogen evolution, hydrogen evolution reflects not obvious. The higher purity of lead, impurity is less, the more light of hydrogen corrosion, the self-discharge will smaller.

2, nickel-cadmium batteries self-discharge performance

For the sufficient electricity nickel oxide electrode, due to instability of the manganese dioxide, in the process of storage, prone to oxygen evolution reaction, resulting in self-discharge. Cadmium anode in the electrolyte solution is very stable, so nickel-cadmium batteries self-discharge rate is smaller, but the high-rate discharge nickel-cadmium batteries, due to a larger electrode surface area, so a larger self-discharge rate.

3, Ni-MH battery self-discharge characteristics

Like other batteries, nickel-metal hydride batteries are also have certain self-discharge phenomenon. High-voltage nickel-metal hydride battery device is to make the battery shell filled with hydrogen, the negative electrode active material of hydrogen and electric power active material nickel oxide cathode in direct contact occurs during the hold to reflect self-discharge.

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By admin, November 13, 2009 9:04 pm

1. What does the ambient temperature affect the battery performance?

Low temperatures (e.g. -15C) will obviously reduce Ni-Cd and Ni-MH battery discharge rate. At -20C electrolyte is at its freezing point, charge speed will greatly slow down. At low temperature (under -15C) charge will raise the internal gas pressure and probably unseal the safety vent. Ambient temperature of 5C to 30C is the best range to get effective charge. Generally with temperature rising charge efficiency will become higher. But when the temperature rises to 45C or higher, the materials performance in the battery will be degenerated and battery service life will be shorten greatly.

2. What does the “Over-charge” affect the battery performance?

 ”Over-charge” is described as a continuous charge action after the battery has been fully charged by a certain charge method. Since the capacity level from positive polarity is higher than the negative polarity, the positive polarity will generate Oxygen, which can be composed with the Cadmium generated from negative polarity via seperator. In general condition, the internal pressure will not increase significantly, however, if the charging-current applied for battery is too much, the charging-time is extremely long and finally the Oxygen could not be used up in time, the battery will be defected by a pressure risen, battery distortion, leakage and so on. Definitely the battery’s performance will decline as well  

3. What does the “Over-discharge” affect the battery performance?

If a cell’s voltage reaches a designed value, that means the battery has discharge the stored capacity, but still the discharge action is continual, over-discharge will cause. Commonly the end voltage can be identified through discharge current, for example the end voltage is set at 1.0V/cell as discharged at 0.2C-2C, and 0.8V/cell at 3C or more, e.g. 5C or 10C. Over discharge may cause disaster, especially at heavy current or repeated over discharge. Commonly over discharge can make cell inner pressure raise, and the reversibility of activity materials both in positive and negative will be damaged. Even by charge only part can recover and the capacity is reduced obviously.

4. What does the short circuit affect the battery performance?

Any kinds of conductive material being bridged with the external terminals of a battery will result in short circuit. Based on the battery system, a short circuit may have serious consequences, e.g. rising electrolyte temperature or building up internal gas pressure. If the internal gas pressure value exceeds the limitation of cell cap endurances, the electrolyte will leak, which will damage battery greatly. If safe vent fails to respond, even explosion will occur. Therefore don’t short circuit.