Tuesday, July 30, 2013

How Do You Know Where Your Vendor Is Located?

The web is a beautiful place to shop and find product and information. However it also facilitates any Tom, Dick or Harry to set up shop.  It is important  to know who you are buying from, where they are located and how long they have been in business.
When you consider sharing your personal information and credit card number, see how candid the vendor is with providing their background on the "About Us" page. Do they provide an address and phone number on their "Contact Us" page.
Who is the President or owner of the company"
Do they provide you access to the Terms & Conditions of the sale of merchandise?

Monday, July 29, 2013

What is a Zinc–air battery?

Zinc–air batteries (non-rechargeable), and zinc–air fuel cells (mechanically-rechargeable) are metal-air batteries powered by oxidizing zinc with oxygen from the air. These batteries have high energy densities and are relatively inexpensive to produce. Sizes range from very small button cells for hearing aids, larger batteries used in film cameras that previously used mercury batteries, to very large batteries used for electric vehicle propulsion.
During discharge, a mass of zinc particles forms a porous anode, which is saturated with an electrolyte. Oxygen from the air reacts at the cathode and formshydroxyl ions which migrate into the zinc paste and form zincate (Zn(OH)2−
4
), releasing electrons to travel to the cathode. The zincate decays into zinc oxide and water returns to the electrolyte. The water and hydroxyls from the anode are recycled at the cathode, so the water is not consumed. The reactions produce a theoretical 1.65 volts, but this is reduced to 1.35–1.4 V in available cells.
Zinc-air batteries can be used to replace now discontinued 1.35 V mercury batteries(although with a significantly shorter operating life), which in the 1970s through 1980s were commonly used in photo cameras.
Source Wikapedia

Saturday, July 27, 2013

List of battery sizes

Some common primary and secondary battery types in household and light industrial use. A battery may consist of a single cell, or two or more cells in a single package (for example, the 1604 9-volt battery which has six cells).
The long history of disposable dry cells means that many different manufacturer-specific and national standards were used to designate sizes, long before international standards were agreed upon. Technical standards for battery sizes and types are published by standards organizations such as International Electrotechnical Commission (IEC) and American National Standards Institute (ANSI). Many popular sizes are still referred to by old standard or manufacturer designations, and some non-systematic designations have been included in current international standards due to wide use.
The complete nomenclature for the battery will fully specify the size, chemistry, terminal arrangements and special characteristics of a battery. The same physically interchangeable cell size or battery size may have widely different characteristics; physical interchangeability is not the sole factor in substitution of batteries.
Battery sizes 4,5 D C AA AAA AAAA A23 9V CR2032 LR44
 Wikapedia

Thursday, July 25, 2013

Alessandro Volta: inventor of the electrochemical battery

Alessandro Giuseppe Antonio Anastasio Volta (18 February 1745 – 5 March 1827) was an Italian[1][2] physicist known for the invention of the battery in the 1800s.
In announcing his discovery of his voltaic pile, Volta paid tribute to the influences of William NicholsonTiberius Cavallo, andAbraham Bennet.[9]

Voltaic pile
The battery made by Volta is credited as the first electrochemical cell. It consists of two electrodes: one made of zinc, the other of copper. The electrolyte is either sulfuric acid mixed with water or a form of saltwater brine. The electrolyte exists in the form 2H+ and SO42−. The zinc, which is higher than both copper and hydrogen in the electrochemical series, reacts with the negatively charged sulfate (SO42−). The positively charged hydrogen ions (protons) capture electrons from the copper, forming bubbles of hydrogen gas, H2. This makes the zinc rod the negative electrode and the copper rod the positive electrode.
Thus, there are two terminals, and an electric current will flow if they are connected. The chemical reactions in this voltaic cell are as follows:
zinc
Zn  Zn2+ + 2e
sulfuric acid
2H+ + 2e  H2
The copper does not react, but rather it functions as an electrode for the electric current.
However, this cell also has some disadvantages. It is unsafe to handle, since sulfuric acid, even if dilute, is dangerous to human beings. Also, the power of the cell diminishes over time because the hydrogen gas is not released. Instead, it accumulates on the surface of the zinc electrode and forms a barrier between the metal and the electrolyte solution.

Monday, July 22, 2013

What is a Silver-oxide battery?

A silver oxide battery (IEC code: S) is a primary cell with relatively very high energy/weight ratio. Their cost is linked to the price of silver. They are available in either very small sizes as button cells where the amount of silver used is small and not a significant contributor to the overall product costs, or in large custom design batteries where the superior performance characteristics of the silver oxide chemistry outweigh cost considerations. 
The large cells found some applications with the military, for example in Mark 37 torpedoes or on Alfa class submarines. Spent batteries may be processed for their silver content.
(source Wikipedia)
Popular silver-oxide coin cell CR2032

Saturday, July 20, 2013

AGT Special Deal Item Motorola RLN4833A

On Sale (while quantities last)  Motorola Original RLN4833A: Travel / Vehicle Charger 
90 min rapid charger. Travel Charger that plugs into the vehicle cigarette lighter includes cigarette lighter plug. Mounting bracket is included. (An optional AC transformer part # 2580600E05 is available for 120V to convert charger to desktop use inside a building). Charger will charge a battery or radio with battery. Radio can be turned on or off when charging (therefore acting as battery eliminator while connected to charger). 
Fits portable radio models: GP300, GTX, P110, P1225, P1225LS, LTS2000.