When a rechargeable battery is fully charged, is it heavier than when it is discharged?
354850
No. Recharging just re-polarizes the terminals.\n\nThe energy added to the system is used to push the electrons, or holes back to the end where they started when the battery was originally delivered to you.
532957
Rechargeable lasts longer in digital cameras and such.  Regular AA batteries will die in like 20 minutes if not before.  They just drain real quick.  Buy the rechargeable and get a battery charger.  They are cheap.
244068
The conducting ink forms a resistor which does load the battery.  The thermochromic strip lies along the resistor and responds to the heat it generates.  The resistor is tapered, so its resistance per unit length increases as it gets narrower, and so does the temperature due to current flow.  The point along the strip where the temperature reaches the color-change value depends on the amount of current flowing in the resistor.  Thus the length of the changed color section indicates battery freshness.  This is a very approximate test.  A better tester loads the battery similarly, but measures the battery voltage under such loading.
1181375
not that quikly. The flux of the magnet would have to flow in the same direction as the battery to assist the flux that is already flowing from negative to positive. That's why batteries go down by themselves. If you cut a hole in a piece of paper the same size as the battery and put the battery half-way in, put some metal filings around it and you can see the magnetic flux I'm talking about.
520542
yes they will hold a charge longer.  batteries natually burn off a small amount of energy due to an imperfect storage method.  putting them in a colder environment slows down the chemical reaction responsible for this.
208780
A battery is a storage device. If it is "under constant charge" it is unnecessary, since the electricity charging it can be used to power whatever you are using the battery for. If you mean there is constant power to the battery but not enough to perform the work, then you need to give more information, basically coming down to how much power is coming from the battery to make up the difference, and how big a battery and is it at full charge at the beginning.\n\n"Horse" - if you mean horsepower, is the work done by the motor. It has little to do with how much battery power you need to run the motor, which depends more on the size of the motor. The work done depends on the torque produced when power is applied to the motor.\n\nSee http://en.wikipedia.org/wiki/Maximum_power_theorem
945273
reharsing with loaded guns
881673
The non rechargeable batteries the chemical reaction is not reversible. U are lucky that it didn't blow up.
936680
1.)   The battery contains 4 amp hours of electrons.  This means it can be drained at the rate of 1 amp per hour for 4 hours.\n2.)   So, if you are only draining it at the rate of 1//4 amp per hour it will last 4 times as long or 16 hours.\n3.)   Just think of a battery as a bucket full of water e.i. The slower you pour it out the long it lasts.
283480
If you're storing them then it will improve their life because it slows down the rate of chemical reaction but it won't improve their power.\n\nA warm battery works better than a cold one because the chemical reaction is quicker.  If you take a torch out on a cold night the light will fade much quicker than if you took it out on a warm night.\n\nFreezing won't recharge a battery , once the energy's been used it's gone for good.  The law of energy conservation tells us that "Energy can never be created or destroyed only converted from one form to others".
591652
Batteries use the different potential that certain chemicals have. Battery consists of 2 chemicals which potential different are significantly enough to generate voltage difference. Reaction happening in a battery is redox (reduction-oxidation) which allows electron transfer. Positive terminal of the cell has the higher potential.\n\nAs the reactant are all used up, reaction reaches equilibrium. This is when we found out that the battery is 'dead'.
1113235
Could be a dead battery. The lifetime of lithium ion batteries varies with temperature, number of recharge/discharge cycles and percent of discharge and percent of recharge. Complete, 100% recharges actually shorten the lifetime, but, complete discharges are worse. Partial discharges and partial recharges can lengthen the usable life. The lower the storage temperature, the better, but, DO NOT freeze. High heat, such as in a vehicle or storage building in summer drastically shortens the expected lifetime. A lithium ion battery's normal lifetime is about 3, maybe 4 yrs. Best longtime storage is at 40ish degrees F with about 40% charge. ( just the battery, not the device )
850091
I think that the answer must be YES.\n\nLet's assume that  these are dry cell batteries (so they are not losing any matter by evaoporation or gaining any by using oxygen in the atmosphere.\n\nSo no particles get in or out of the battery.  However, the battery, once spent, has lost some energy (perhaps by powering a torch which then gives out light and heat energy).\n\nAccording to Einstein's famous equation, E=mc^2.  So this amount of energy must be equivalent to (an extremely small) quantity of matter and the mass of the battery must have reduced by this amount.  It will not be measurable in ordinary circumstances and I am sure that other factors (eg dust particles settling on it, etc) would FAR outweigh this mass of the released energy.  But theoretically, yes, it would weigh less.\n\nOne gets a similar kind of balance in radioactive decay; a uranium nucleus decays into some other bits and pieces but the mass of the other bits and pieces is slightly less than the mass of the original uranium nucleus in order to account for the energy that is released (in the form of EM radiation).\n\nHope this makes sense.
130352
as stated by Kobe, the chemicals inside the battery cause a "difference in potency" at the end caps of the battery. One cap has a surge of positively charged static, and the other, negatively charged static. This causes that whatever is put close to the battery caps, and is a "good conductor" (not like wood, more like metal), will be driven to let direct current flow through it. This process will last for as long the chemicals inside the battery wouldn't mix all together. The "workload" driving negative surge on one side and positive surge on the other causes chemicals to mix all together. When this comes to happen the battery will stop working.
40400
No. However, it will make the battery last a tad longer than if you left it out at room temperature. \n\nBasically, your battery is storage for electrons. If you just leave a battery out, those electrons will try to ground themselves (leave) from the battery. The more you lose, the less enegy there is in the battery. Most smaller batteries are dry cells. The free elctrons are formed from chemical reactions within the battery itself. \n\nPutting batteries in the freezer will not re charge it, but it will slow down the chemical reactions so that not s many electrons are wasted. \n\nSUMMARY: Freezing your batteries won't recharge it, it will help them retain its charge if left un-used.
452810
No, it's not true. You'll destroy your charger. \nAlkaline batteries are not designed to be charged.
286535
Basically what it's saying is this:\n\nThose battery tester strips have a special ink which allows for the batteries charge to travel across it.  The more charge the battery has, the further it can travel.\n\nSo, when you test a battery, and it's charge is weak -- it's charge will only 'travel' partially across this special conductive ink.\n\nThe thermochromic and normal ink mentioned are largely for display/cosmetic purposes.  These basically allow you to see how far the charge has travelled across the conductive ink layer -- and thereby see that this battery is "good" or "bad".  \n\nHope that helps.