Batteries

Alessandro Volta invented the first battery called a voltaic pile made of two dissimilar metal plates in a brine solution in 1800.
The first practical battery was developed using the Leyden jar. The Leyden jar was invented in 1745 by both Ewald Georg von Kleist and Pieter van Musschenbroek. The Leyden jar was a single cell electrical storage device. A battery requires 2 or more cells to be called a battery. In 1745, multiple Leyden jars were connected, thus creating the first battery.

Mains supply provides alternative current while battery provides direct current.

the surfice

Yes as long as the battery and bulb are rated at the same voltage.

(Boy Scouts do it every day with flashlights.)

The date on a Duracell battery is the production Date and should be good for between 5-10 years. It will look like MAR 2014.

Probably not. That number has to do with the size of the battery, as in 2032 mm in diameter versus 2033 mm. I'm not positive about that one. One milimeter is pretty small so it more or less depends on the room in whatever item/tool/thing you're replacing the old one in. If the old one has a bit of 'wiggle room' you'll probabaly be okay.

But why not just buy the corretc one. You can get them pretty cheap on Amazon and elsewhere.

That will depend on the sum of the load resistance and the internal resistance of the battery (this is true for all power sources, not just 6 volt batteries).

Small compact batteries tend to have higher internal resistance and therefore are more limited in the current they can deliver to a given load than larger batteries.

All rechargeable batteries such as cell phones, cordless phones, laptop computers, etc., need to be allowed to fully discharge and then recharge to full power to prevent them from acquiring a "memory". If they are always kept at full charge, then it will actually shorten the battery life, making the time between re-charging shorter.

A 5600mAh battery can last anywhere from a few minutes to several hours depending on the device it is used in. Typically most cell phones can last for many days with limited usage.

On my Swiss Army watch there are notches on the back cover plate. They guy at the jewelry store has a fancy little wrench that fits in there. I've done it with a pair of needle nose pliers. Open the pliers, fit the ends in two of the notches oposite each other and turn. The cover will unscrew and the battery is there....

This doesn't work well. Perhaps the needle nose pliers are a particular brand of length. I own seven different pair of needle nose pliers and only one could reach the notches. Once you reach the notches the tip of the plier will not stay in the notch once presure is applied. All you will end up with is a scratched watch case. Take it an authorized dealer or other business that has the right tool to open the case. It's not worth ruining an expensive watch just to save a couple of dollars to change the battery.

Addendum by John Michael Shaw....

Go to a art supply store and get an adjustable drawing compass that has two metal points. Use a magnifying glass and a good light to see what your doing. Place each point of the compass at opposite groove marks on the back of the watch. Make sure to have the watch on a soft, firm, gripping type of surface... something rubbery to keep it from turning as you hold it. Press the compass firmly and try to rotate it SLOWLY counterclockwise. Be carefull and use the light and magnifier to see if your turning it or just scratching the watch. If it doesn't want to cooperate pay the bucks and have a jewelry shop do it.

Addendum by Greg Nelson

Buy the fancy little wrench on eBay for $11 (including shipping!) from Hong Kong. Works great on all the different notched screw on backs. Change your own batteries and save big bucks and don't ruin your watch case with sharp tools. Search eBay for "Watch Case Wrench".

Addendum

Use two thumbtacks. This works well because I just did it! My Swiss watch (Swiss Military--The Genuine) has six notches on the back face. I took two thumbtacks (the kind with be big coloured plastic ends to hold) and pushed counterclockwise. You can either get someone to hold the watch so it doesn't just spin around, or position your hand so that that stops it from turning.

Be careful not to jab yourself because you have to push very hard with the tacks and if they slipped, they'd go all the way in your hand. Ouch! It does take quite a bit of torque, but it gives. Then I just lifted off the white plastic protector inside and pried the battery out with one of the tacks. Mine had a Maxell SR726SW battery inside. The internet says they're worth $1-2. I'm sure I'll pay ten at the drugstore.

DIY for life!

Addendum

The o-ring also needs to be inspected and possibly replaced to make sure it is water-resistant. The service centers you vacuum and pressure tests to make sure it is correctly sealed. You may save the money by doing it yourself but you also run the risk of not having it seal correctly and thus leaking.

ADDENDUM: I used a pair of scissors with pointy tips and it was really easy to open.

it last for 240 hrs on stand-by,means when the phone is on sleep mode.Also it last for 8 hrs on talk time 3g/3g

please test it by some defined flashlight, like maglite, imalent, fenix.

It depends on the brand of battery on how many times you can use a rechargebable battery. Some brands are better than others. I would guess it to be around 4.

wireless things, keyboards, mouse, etc.

also flashlights, phones, remotes, etc.

it is very easy to change the battery on a 2001 Chrysler Sebring. You just need to take the battery terminals off the old battery and then replace with the new battery. Make sure to replace the terminals on the correct battery post.

AAAA batteries are similar to AA or AAA batteries in shape, but are smaller. Their smaller size makes them well suited for relatively small devices, such as small flashlights or laser pointers.

That depends on the current drawn from it. Standard D cells are rated between about 10,000 mAH to 15,000 mAH. Therefore a load drawing 100 mA from a D cell should give a lifetime of somewhere between 100 hours to 150 hours. More current shorter life, less current longer life.
No set answer to that, it depends on the power consumption of whatever they're connected to.

Get your bulb, it should be a very small wattage (weak) one, get your battery and wires, connect one wire to plus side of abttery and other wire to minus side of battery, then connect to the bulb, you may have to play around a bit to find a connection that produces light.

I'm actually charging my 12V sealed lead acid battery with a laptop adapter which output is 19V, 2.1A. I'm not sure this will shorted the life of my battery or not, but the battery hold the charge.

I don't have a voltmeter to test the voltage, but the battery can light up a 12V car headlight light bull. So, I guess it work.

Yes you can. I answered a similar question to this a few weeks ago. The mAh figure is simply the capacity of the battery. So long as it's the correct dimensions and voltage - it will be fine. I have a Sony Ericsson mobile - which had a 600 mAh battery in it. I replaced it with a 950 mAh battery - which has extended the time between charges.

Well, in my science experiment, apple is the best fruit battery, then the lemon, then the orange. Remember to change the V--- on the left of the voltmeter and make sure it's 2000m.