Posts in 2010 Mar 05

The temperature affection for different battery

2010-03-04 21:28:54

The temperature affection for different battery

Nickel-metal hydrides are less tolerant than nickel-cadmium in terms of the charge at low or high temperatures.
Nickel-metal-hydride can not load quickly at temperatures below 10 ° C, nor can they load slowly below 0 ° C. Some chargers are designed so that they Ladekoeffizienten and the ambient temperature change. Price considerations are not allowed to provide Apple PowerBook G4 12 inch Battery battery chargers for consumer electronics with temperature sensors.

At higher temperatures, the charge acceptance of nickel-based Apple PowerBook G4 Battery is drastically reduced. A battery that can hold at room temperature, a medium capacity of 100%, starts at 45 ° C ambient temperature, only 70%, and even only 45% at a temperature of 60 ° C. This highlights the poor performance of some car chargers in the summer!

Lithium-ion Apple PowerBook G4 15 inch (aluminum) Battery provide a good charging in to deep as well at high temperatures. Some cells allow charging with 1.0 C from 0 ° C to 45 ° C. Most lithium-ion cells, however, prefer a lower charge current when the temperature at 5 ° C or falls below. Must be dispensed on the loading below the freezing point, as a coating can be effected by lithium metal.

The lead-acid Apple PowerBook G4 17 inch Battery is not very sensitive to extreme temperatures, as we all know, on the basis of experience with our car batteries. Part of this tolerance is the inertia of lead-acid systems are attributed. Some battery models allow a shop below the freezing point with a small charging current, while others are damaged, and provide only reduced capacitance values, and life expectancy is shortened.

To improve the loading performance of lead-acid Apple PowerBook G4 17 inch Battery at low temperatures and prevent thermal effects during the warm-up, it is important to monitor the charging voltage limits to be set. An installation of this measure can extend the life expectancy of a battery up to 15%. General guidelines recommend making a correction of about 3mV per cell per degree Celsius. The voltage correction has a negative coefficient, ie The threshold voltage decreases when the temperature rises.

Heat kills the Apple MacBook Pro 17 inch Battery! The warmer the cells shorten, the life expectancy. Higher temperatures may not always be foreseen, especially during a fast charge. It must, however, attempt to keep these periods as short as possible. While 45 ° C is temporarily tolerable, begin a battery from 50 ° C damage is increasing. Moreover, cells are warmer in the interior of a battery, always a few degrees when the temperature of the battery case.
Ultra Fast Chargers

Some manufacturers of chargers promise amazingly short loading time of 30 minutes or less. With well-balanced cells and moderate temperature can nickel-cadmium VGP-BPS10 s batteries, which are designed for fast charging, are being charged in a very short time. This is achieved with a simple increase of the charging current during the first 70% of the charge cycle.

The article Via battery blog

Category : battery

85Wh Lithium-Ion 9Cell Latitude D820 Dell battery review

2010-03-04 21:39:42

85Wh Lithium-Ion 9Cell Latitude D820 Dell battery review

As we all know, the Latitude D820 is higher than the thin and light 14 "widescreen D620 and the budget oriented 14" standard aspect Latitude D520 battery in the lineup. The D820 is an updated version of the latitude D810 battery and features the Intel Core Duo processor to replace the D810 Pentium M and a significant weight reduction in the D810.

As its big wid screen, so the latitude d820 battery is also can not afford its 3 hours daily work. The first year I bought D820, I used the battery frequently as work and travel, fortunately it died after 10 moths in the dell 1 year warranty. I do not know why the machine is 3 year warranty but the battery is only 1 year warranty. Now I know, after the 3 year used 3 batteries replacement (the second year I buy a Macbook for travel). Now I find some reivew about Dell latitude d820 battery.

I bought 2 types Dell latitude D820 battery : 6Cell and 9Cell. I do not want to say anything about my bad 6 Cell battery (the one died after 10 month). Below is the 9Cell 85Wh batetry photos.

The Latitude D820 battery Tech specs :
Device Type : Notebook battery
Technology : 9-cell lithium ion
Capacity : 85 Wh
Recharge Cycles : 300-500
Work with : Dell latitude D820, Latitude D830 battery

Customer review in Dell web site:

I have run through three laptop batteries in four years on the D820. Only use is CPU and HD, never DVD. Typically charge starts to drop off in 9-12 month time frame to the point that unit will not run on battery for even 1 minute. This is totally unacceptable; by comparison original Mac batty still going strong after several years. Bye, bye Dell - you have ignored this user-expensive issue for years.

I've been a loyal Dell user for years. However, the next laptop I or anyone in my family or circle of friends buys is most likely going to be something other than a Dell. Why? Because if Dell consciously ignores this abundantly-documented laptop battery life problem, who knows what self-serving obsolescence might be built in to newer Dell laptops? This battery fiasco is one of the easiest ways for Dell to lose loyal customers who consistently seek out high-end products because of their requirements for quality and reasonable product life cycle

I purchased 2 extended batteries with my new Latitude D820. Both batteries failed within 1 year. This is not acceptable for items of this cost. If they are this unreliable they should be covered under the extended warranty

Lasted about 14 months the died completely like my Latitude D620 battery. Just made it out of warranty. I guess there was clause in my extended 3yr warranty that the battery is not covered.

The Dell latitude D820 battery replacement Review in Amazon:

This battery, while appearing to be the same size as the Dell original, is just a few millimeters off. As a result, my battery rarely charges.The battery can be docked, but the metal connectors in the battery are not (sufficiently) touching the pins in the system to charge the battery.

To resolve, I have to do everything from jiggling the battery to completely removing & resetting it. Even then the problem is not guaranteed to go away. Finally, the Dell Latitude D830 battery has never charged fully. When the charge is working , it always seems to quit around the 90% area. Since I've had my new battery, I've been running on A/C most of the time, but I am dreading my next trip when I longer have an outlet to plug into.

I received the Batery for my Dell D820, and it fit perfectly! On the Positive side, it was a perfect fit, and when the hard drive is not whirring, the charge indicator says I have over 5 hours of batery life left, which is great. The color of the battery differs from that of the computer only slightly.

On the negative side, the build quality doesn't look as sturdy as the original, and the charge indicator lights look a bit "flimsy", but then again, the original Dell latitude D520 battery lasted me only a year.

Even if this one lasts for the same ammount of time, it still cost me LESS THAN HALF of what an original Dell battery would have cost... As far as I'm concerned, I would recommend this product to anyone who owns a Dell and donesn't want to get ripped off buying $300 battery that will only last a year, maybe even less.

The article Via Laptop Battery blog

Category : battery

How to Using the Memory Card Reader in you laptop

2010-03-04 22:19:00

How to Using the Memory Card Reader in you laptop

After you have a good weekend with you family, yes you take a lot photos with your Canon Camera. When you want to store them in your laptop. How do you do that? Oh you know "Using a Memory card reader to install the camera memeory card in your computer. But how to use the memeory card reader in laptop?

Removing a Memory Card or Blank

Note: Before you begin of procedure in this section, please follow the safety instructions in Dell Inspiron 1300 Battery Product Information Guide .

Note: in the notification area (click on the icon) and select the card before, you can use the memory card's configuration utility from the ability to stop and remove from your Inspiron 1100 Battery computer. If the card does not stop the configuration utility, you may lose data.

Press and release it from the card reader slot. When it is emitted partially, remove the card.

Method of Memory Card Installation

Note: Before you begin of procedure in this section, please follow the safety instructions in Product Information Guide .

If your computer laptop battery is running and you install a memory card into your computer. The computer automatically detects the card.

In general, the memory card label symbols, triangles and arrows (and) will be marked to indicate the end inserted into the slot for and with. Key to prevent incorrect insertion of the Dell Inspiron E1505 Battery card. If not clear if the orientation of the card, please refer to the documentation that came with the card.

Hold the card with the top side facing up.

Slide the card into the slot until the card is completely seated in its connector.

Cases, too much resistance occurs please do not force the card. Check the card orientation, please try again.

The computer recognizes the device driver automatically load the VGP-BPS8 appropriate memory card. If the configuration program, to load the manufacturer's drivers, the media comes with a memory card you use to tell if applicable.

Usually we suggest you install the Memory card when the Dell RN873 Dell PC764 battery in, as the sudden power off can damage the card.

The article via laptop battery blog 

Category : battery

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