NiMH batteries have become popular for powering many electronic devices. They come in high capacity and lower capacity sizes. NiMH batteries are rechargeable and can be recharged using a standard NiCad battery charger or with a charger specially made for them. If a NiCad charger is used it will take longer to get a full charge since NiCads have a lower capacity. NiMH chargers are obtainable in what is known as smart charge or in timer controlled types. The timer controlled charger can be set to charge for a fixed length of time and will then shut off. Smart chargers do not charge for any fixed period but rather keep charging till the battery is completely charged before shutting off.
You might ask why everyone does not use a smart charger. The simple answer is that they are considerably more complex in construction and as a result cost more. So some users will opt for the fixed time charger so as to save some money. There is some saving to be made on the purchase price but there can be problems, due to partial recharging, as the timer shuts down the charger before a full charge has completed. This is annoying and for this reason most users will be well advised to get a smart charger at the somewhat higher price.
However if only lower capacity batteries are to be used a fixed time charger can perform this function quite well. For high capacity batteries a smart charger is definitely the best choice.
Solar powered battery chargers are available and these will recharge your batteries where no power source is present. They are very useful if you are camping outdoors but the charging rate is quite low so that a long time is needed to fully charge a battery. They definitely have a use for anyone who cannot get to a power supply to recharge batteries but otherwise a smart charger is a better choice.
Several battery companies now make low self discharge batteries. These can keep 70% to 85% of their capacity when stored for a year at room temperature. In the same period of time ordinary NiMH batteries may lose 50% or more of their charge. LSD NiMH batteries are rechargeable just like normal batteries and can be recharged using the same battery chargers.
Their main difference is much longer shelf life and a higher price. These LSD batteries can be charged up to 1000 times which is double the figure for ordinary NiMH batteries. This makes them very economical for long term usage.
To be certain that you are really buying LSD batteries you should look for the specifications to be printed right on the battery casing. Some suppliers have been known to repackage standard batteries and label them LSD when they are not. It is essential to look for the specifications on any rechargeable battery in order to be sure you are buying the type of battery you want.
Consumers who make a lot of use of battery powered devices will find that rechargeable batteries, although more expensive initially, will provide huge savings over the cost of purchasing hundreds of standard batteries.
The well known Eneloop battery made by Sanyo has been brought out in a new version which can keep 75% of its charge for a period of three years, and can take up to 1500 recharges. Rechargeable batteries probably will continue to improve in future years.
Article Source: http://EzineArticles.com/?expert=John_Mowatt
Monday, March 29, 2010
Sunday, March 28, 2010
3 IP Megapixel Cameras That Deserve a Second Look
There are few that can honestly disagree with the advantages that cameras bring to the table. Higher quality in the surveillance world translates to an increased ability to read license plates and faces, two of the most important details that most business owners need to record in the case of theft or other criminal activity. Another benefit of the camera system is that it allows you to use your current IP network to handle the complex technical connections. While the upfront cost of upgrading to an IP megapixel system may be a bit more expensive than their analog counterparts, the higher quality you get will more than make up for the upfront investment costs.
That said, if you're looking to dive headfirst into technology, it's always a good thing to see the best IP megapixel cameras available on the market. There's three cameras that deserve a second look; these three cameras represent a modest balance between cost, features, and quality.
The first camera to look into is the Bosch NWC-0900. This is a day/night camera designed for superior performance regardless of the time of day. Unlike other cameras, this camera has two sensors to facilitate in providing high quality 24-hour surveillance. Since storage is one of the most precious resources within surveillance, it's important to build a security network that can work within the boundaries of the storage available. The NWC-0900 does just that -- you can adjust the settings to reduce the impact on storage and speed without hassle.
The second camera that deserves a second look is the Sony SNC-DM110 IP megapixel camera. What makes this camera worth a second look is the dome design -- it's more resistant to the elements, which means that it can used outside under awnings and other protected outdoor areas. A dome design in a security camera also has an added benefit of being very difficult for criminals to destroy in order to keep from being monitored and their faces possibly recorded.
The third and final camera that deserves a second look is the Samsung SNC-C7478C, which is actually an IP megapixel camera as well as being a PTZ (Pan, Tilt & Zoom) camera. The best aspect of this camera is the ability to move, tilt, and zoom in on areas of interest within a surveillance area. Motion detection is also supported, which means that a camera can move to follow the source of the movement. This type of camera would be excellent in an environment where surveillance is necessary, yet there is not a lot of activity. The motion detection would ensure that any sign of activity would get looked into before it would be able to be dismissed.
All things considered, these cameras definitely deserve a second look. However, the key to really making technology work well in your business will be to take the three cameras mentioned here and really look at the features they all have. The right camera for your needs will mostly have a mix of all the features presented here, but the information in this guide should be more than enough to get you started in the right direction.
Author is an expert on Ip megapixel cameras and recommends Samsung cctv products.
Article Source: http://EzineArticles.com/?expert=Emily_Robinson
That said, if you're looking to dive headfirst into technology, it's always a good thing to see the best IP megapixel cameras available on the market. There's three cameras that deserve a second look; these three cameras represent a modest balance between cost, features, and quality.
The first camera to look into is the Bosch NWC-0900. This is a day/night camera designed for superior performance regardless of the time of day. Unlike other cameras, this camera has two sensors to facilitate in providing high quality 24-hour surveillance. Since storage is one of the most precious resources within surveillance, it's important to build a security network that can work within the boundaries of the storage available. The NWC-0900 does just that -- you can adjust the settings to reduce the impact on storage and speed without hassle.
The second camera that deserves a second look is the Sony SNC-DM110 IP megapixel camera. What makes this camera worth a second look is the dome design -- it's more resistant to the elements, which means that it can used outside under awnings and other protected outdoor areas. A dome design in a security camera also has an added benefit of being very difficult for criminals to destroy in order to keep from being monitored and their faces possibly recorded.
The third and final camera that deserves a second look is the Samsung SNC-C7478C, which is actually an IP megapixel camera as well as being a PTZ (Pan, Tilt & Zoom) camera. The best aspect of this camera is the ability to move, tilt, and zoom in on areas of interest within a surveillance area. Motion detection is also supported, which means that a camera can move to follow the source of the movement. This type of camera would be excellent in an environment where surveillance is necessary, yet there is not a lot of activity. The motion detection would ensure that any sign of activity would get looked into before it would be able to be dismissed.
All things considered, these cameras definitely deserve a second look. However, the key to really making technology work well in your business will be to take the three cameras mentioned here and really look at the features they all have. The right camera for your needs will mostly have a mix of all the features presented here, but the information in this guide should be more than enough to get you started in the right direction.
Author is an expert on Ip megapixel cameras and recommends Samsung cctv products.
Article Source: http://EzineArticles.com/?expert=Emily_Robinson
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