How much current flows through Two 5 1/2V batteries connected in parallel to a 3ohm resistor?

Based upon Ohms law (Ohms = Volts/Amps), the draw against this battery will be 1.83 amps. How long the battery will last with this type of draw will vary by chemistry and the capacity of the battery itself.

Best AA batteries for your Camera

A lot of us need AA to power our digital camera. Alkaline are just plain terrible and rechargeable is the best option for this high drain device. Now, in the rechargeable world of batteries. I found that the best AA batteries to power your camera are made by Powerex.
Forget Duracell or Energizer... They won't last as long as this Powerex AA batteries. PowerEx NiMH rechargeable batteries capture both ultra high capacity and long life and can also be recharged hundreds of times. PowerEx rechargeable batteries are specifically designed for high drain applications such as digital cameras and other portable electronics.

Why batteries of different sizes have the same voltage?

The voltage is based upon the chemistry of the battery. The base unit of a battery is called a cell. When you combine 2 or more cells, you have a battery. A single cell will have what is called a nominal voltage based upon what chemicals are used to make up the battery. For alkaline, the chemistry is generally a magnesium dioxide mix, which has a nominal voltage of 1.5V per cell, regardless of the size. Rechargeable chemistry types like Nickel Metal Hydride (NiMH) and Nickel Cadmium (NiCd) have a nominal voltage of 1.2V per cell (even though some people list it as 1.25). The chemical reactions inside the cell will determine the output voltage. The capacity or run time can definitely be impacted by the size. Compare an alkaline AAA to a D cell. Even though they have the same voltage based upon the chemistry, the D has a much greater capacity based upon the volume of chemicals in the can. If you want to change the voltage, the only way you can go is up by connecting the cells or batteries in a series connection (positive of one cell to negative of the other). To increase capacity, but keeping the same voltage, connect the cells or batteries in a parallel connection (positive of one cell to positive of the other cell).

Rayovac, Duracell or Energizer - Which one is best?

The best battery out there is Rayovac.
Now you may ask why are Rayovac batteries better?

First of all, they are cheaper to buy, Rayovac doesn't spend billions on advertising every year.

But the best part of all is their money back guarantee policy if their Rayovac battery doesn't last as long as Duracell or Energizer batteries of the same type.


I can't find a better deal than this elsewhere. Can you?

Rayovac Money Back Guarantee Infos

New DOT Rule for Passengers Traveling with Lithium Batteries

Effective January 1, 2008, the following rules apply to the spare lithium batteries you carry with you in case the battery in a device runs low:

• Spare batteries are the batteries you carry separately from the devices they power. When batteries are installed in a device, they are not considered spare batteries.

• You may not pack a spare lithium battery in your checked baggage

• You may bring spare lithium batteries with you in carry-on baggage – see our spare battery tips and how-to sections to find out how to pack spare batteries safely!

• Even though we recommend carrying your devices with you in carry-on baggage as well, if you must bring one in checked baggage, you may check it with the batteries installed.

The following quantity limits apply to both your spare and installed batteries. The limits are expressed in grams of “equivalent lithium content.” 8 grams of equivalent lithium content is approximately 100 watt-hours. 25 grams is approximately 300 watt-hours:

• Under the new rules, you can bring batteries with up to 8-gram equivalent lithium content. All lithium ion batteries in cell phones are below 8 gram equivalent lithium content. Nearly all laptop computers also are below this quantity threshold.

• You can also bring up to two spare batteries with an aggregate equivalent lithium content of up to 25 grams, in addition to any batteries that fall below the 8-gram threshold. Examples of two types of lithium ion batteries with equivalent lithium content over 8 grams but below 25 are shown below.

• For a lithium metal battery, whether installed in a device or carried as a spare, the limit on lithium content is 2 grams of lithium metal per battery.

• Almost all consumer-type lithium metal batteries are below 2 grams of lithium metal. But if you are unsure, contact the manufacturer!

What kind of Battery does the Wiimote takes?

The remote control of the Nintendo Wii ( Wiimote ) works with a AA battery.
I recommend using rechargeable batteries / Charger combo for it as you will save some money overtime. Rechargeable battery such as the Rayovac hybrid batteries ( available on Rayovac Direct ) will be able to be recharged up to a 1000 times. If you are a hardcore Wii-gamer, rechargeable batteries are the best option for your Wiimote.

Does AAA, AA, C or D define something else than size of batteries?

The alphabetical system originates from the physical size, not the chemistry (alkaline). One of the first portable power cells was termed an “A” cell. Subsequent cells that were introduced were larger (C, D) or smaller (AA, AAA, AAAA) and were termed as variations off of the “A” cell. Alkaline was not formally introduced to consumers until the 1960’s and only became the dominant chemistry for the standard sizes in the late 1970’s, long after the physical sizes were established in other chemistries like carbon zinc (general purpose) or zinc chloride (heavy duty).

Batteries from camera only last 10 minutes when fully charged?

I hear from some that their camera battery doesn't last as long as it used to.
Before taking the camera in for repair, have the charger checked. If the charger is not doing what it is supposed to be doing, no battery will work for you. Batteries Plus can check out your battery and charger to make sure they are not really the culprit, before paying big dollars for repairs.

Why don't they make Lithium batteries in C and D sizes?

First, the technology within the AA and AAA lithium 1.5-volt batteries is geared towards devices with a heavy demand for energy and are generally used for an extended period of time (like MP3, Digital Cameras and handheld games). The most common applications that use C and D batteries do not have the same power demand profile.
Secondly, the AA and AAA make up more than 60% of the overall market demand for traditional alkaline sizes (AA, AAA, C, D and 9V). The AA and AAA go into more devices, which means more sales opportunities (and more profit) for the manufacturer. The manufacturer will not make batteries if there are no devices for them.
And finally, cost. A 4-pack of the lithium 1.5V AA is up to 3X as expensive as traditional alkaline. Most people are not willing to pay $6 for a 1.5-volt D cell to power their flashlight or kids toy when they could buy 4-alkaline D cells for the same price. At this point it is cost prohibitive to have a C or D 1.5-volt battery.

One side note: there are 3.0-volt and 3.6-volt lithium C and D batteries available. Unfortunately, that voltage is not compatible with devices that require 1.5-volts out of the C or D battery.

Why don't they make 1.5V rechargeable batteries?

1.2V rechargeable batteries can replace 1.5V alkaline batteries in most applications, but they don't work in some electronics, like radios and remote controls. So, why don't they boost the voltage to 1.5V?


The voltage is based upon the chemistry of the battery. The base unit of a battery is called a cell. A single cell will have what is called a nominal voltage based upon what chemicals are used to make up the battery. For example, a standard car battery has 6-cells that each has a nominal voltage of 2-volts per cells (6 cells X 2-Volt = a 12-volt car battery). The “chemistry” of a car battery, in general terms, is lead plates immersed in acid. All lead-acid batteries will be comprised of 2-volt cells. For alkaline, the chemistry is generally a magnesium dioxide mix, which has a nominal voltage will be 1.5V per cell. Rechargeable chemistry types like Nickel Metal Hydride (NiMH) and Nickel Cadmium (NiCd) have a nominal voltage of 1.2V per cell (even though some people list it as 1.25). The chemical reactions inside the cell will determine the output voltage. Unfortunately, you can’t get more out of the chemicals than to boost the voltage.

How to charge Lithium aa batteries and can a normal mah battery charger charge aa batteries that are Lithium?

Ever wondered if this is possible? well the answer is definitely NOT. Only rechargeable lithium ion and lithium polymer batteries should be recharged. Typical AA lithium batteries (like those marketed by Energizer) are not designed to be recharged.

There is a high potential that these batteries will explode if you place them in a charger.