Does a fully charged battery weigh more than a flat battery?
368255
No , Because inside the battery is acid and this acid makes energy.When the battery is flat the acid is dry so the battery can't make energy.
53746
Excellent question!  The air does contribute to the mass (and consequently the weight) of the bag.  However, if you weigh a bag inflated with air and a flat bag you will not observe any difference, no matter how precise your balance is.  This is because when you weigh the empty (i.e. flat) bag, you are actually also weighing the column of air extending from the top of the bag, and actually the entire surface of the balance, to the top of the atmosphere.  When you inflate the bag, you put some air inside, but you also displace an equal amount of air from that column of air above the bag.  Thus the weight of the bag increases slightly but the weight of the air above it decreases the same amount, so the measured weight is the same.  If you were to weigh an empty bag and a bag full of air in a vacuum you would detect a measurable difference in weight.\n\n***Comment on Jennifer's Experiment***\nThe additional weight of the inflated balloon is actually mainly saliva not air.  As per J-bo's answer the bouyant forces cancel out the air that is inside the balloon (the inflated balloon weighs more but the air under it rather than the balance supports the extra weight).  The effect of the weight of the air would only be visible in a vacuum or if the air inside the balloon was at a higher pressure than outside (which it may be in a balloon but generally would not be in a plastic bag)  However, the bouyant force does not negate the existance of the additional weight it just makes it difficult to measure.
452810
No, it's not true. You'll destroy your charger. \nAlkaline batteries are not designed to be charged.
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 )
756949
Answer to your question is 'No' if we neglect slight weight loss due to evaporation of water due to the heat generated while the charging is going on.\n\nThe lead-acid battery is recharged, meaning the chemical reactions are made from discharged to charged, from flat by way of transferring molecule between the positive and negative plates in reverse order then when it got discharged while in use. Therefore, the total weight remains the same at charge and discharge condition, assuming the weight of added electrolyte is negligible.\n\nHowever, one of the problems with the plates in a lead-acid battery is that the plates change size as the battery charges and discharges, the plates increasing in size as the active material absorbs sulphate from the acid during discharge, and decreasing as they give up the sulphate during charging. This causes the plates to gradually shed the paste during their life. It is important that there is plenty of room underneath the plates to catch this shed material. If this material reaches the plates a shorted cell will occur\n\nPS. Lead-acid car batteries for a 12 volt system consist of six cells of 2.1 V nominal voltage. Each cell contains (in the charged state) electrodes of lead metal (Pb) and lead oxide (PbO2) in an electrolyte of about 37% (or 6-12M) w/w sulfuric acid (H2SO4). In the discharged state both electrodes turn into lead sulfate (PbSO4) and the electrolyte loses its dissolved sulfuric acid and becomes primarily water.
631579
2 electrodes and a battery
418101
You need the internal resistance. Then based on the amperage due to load you can figure the I^2R loss in watts for the battery.\n\nThe internal resistance can be determined by adding a resistive load to the battery and monitoring the voltage. The point at which the voltage starts to drop equals the internal resistance of the battery.
962112
Yes the electricity is electron flow,which is the  number of electrons flowing in a cross section of a conductor for one oscilation .\nElectrons have an electrical mass which is equal to \n9.1 x10^-31kg.\nso if you take the number of electron per oscilation times the mass of the electron you have the total electrical mass flowing,\nYou take the total mass(assuming acceleration relative to the earth's center of mass)times 9.8 m/sec^2 would equal the weight of the electrical mass flowing.Hence a used battery would weight less.\nFor the simple reason that in the reaction gas has formed and evaporated and the excess electrons have dissipated and lost mass in the form of heat.\nThe weight difference can only be calculated. since the mass loss is very minute.The mass lost would be energy expanded by the battery divided by C^2.
676845
Volts Per Cell.  I've no idea how many cells your battery comprises, but it's a guidleine to avoid overcharging.
448243
minimal. \npower to weight ratio is significantly more important, as is wing design (the "lift" it can generate).\nplacement only concerns the weight distribution.
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'.
980170
You aren't clear about whether the switch is on in both measurements.  If it is, then the voltage will be the same.  If not, then the voltage will be different because of the voltage drop across the internal resistance of the battery.
306866
I'm assuming you're referring to Lithium-Ion batteries. The immediate advantage to Lithium battery chemistry is higher charge density. Li ions are small and mobile, but more readily stored than hydrogen. Thus a battery based on Li is smaller than one with hydrogen, such as a NiMH or NiCd, and with fewer volatile gases. Because the ions need fewer storage intermediaries, more battery weight is usable as charge, instead of overhead. Thus, Li batteries are lighter than equivalents in other chemistries - often much lighter.\n\nThe Li-ion battery does not lose quality when recharging during laptop use; it is capable of easily regulating back and forth movement of energy from powercell to powercell.\n\nA unique drawback of the Li-ion battery is that its life cycle is dependent upon aging from time of manufacturing (shelf life) regardless of whether it was charged, and not on the number of charge/discharge cycles. This drawback is not widely publicized.\n\nAs a newer chemistry, with more advanced applications, Li batteries command a higher price.\n\nThe Li-ion battery required nearly 20 years of development before it was safe enough to be used on a mass market level. While Li-ion batteries do not suffer from the memory effect, they are not as durable as NiMH or NiCd designs and can be extremely dangerous if mistreated. At a 100% charge level, a typical Li-ion laptop battery that's full most of the time at 25 degrees Celsius, will irreversibly lose approximately 20% capacity per year. This capacity loss begins from the time it was manufactured, and occurs even when the battery is unused. Different storage temperatures produce different loss results: 6% loss at 0 °C, 20% at 25 °C, and 35% at 40 °C. When stored at 40% charge level, these figures are reduced to 2%, 4%, 15% at 0, 25 and 40 degrees Celsius respectively. Every deep discharge cycle decreases its capacity, and the degradation is sloped such that 100 cycles leave the battery with about 75% to 85% of the original. When used in laptop computers or cellular phones, this rate of deterioration means that after three to five years the battery will have capacities that are too low to be usable.\n\nOne great advantage of Li-ion batteries is their low self-discharge rate of only approximately 5% per month, compared with over 30% per month and 20% per month in nickel metal hydride batteries and nickel cadmium batteries, respectively.\n\nAnother great advantage is the fact that, unlike other types of rechargeable batteries, the lifespan of a Li-ion battery remains relatively unaffected if they remain "plugged in" after they have been fully charged.\n\nUnlike NiCad batteries or NiMH batteries, lithium-ion batteries should be charged early and often. However, if they are not used for a longer time, they should be brought to a charge level of around 40%. Never use the battery care functions some cellular phones provide for nickel based batteries. (This will deep cycle the batteries.) \n\nLi-ion batteries should be kept cool. Ideally they are stored in a refrigerator. Aging will take its toll much faster at high temperatures. Keeping them in very hot cars can kill lithium-ion batteries. \n\nStoring a Li-ion battery at the correct temperature and charge makes all the difference in maintaining its storage capacity. Note that it is very important not to store your battery at full charge. A Li-ion battery stored at 40% charge will last many times longer than one stored at 100% charge, particularly at higher temperatures.\n\nIf a Li-ion battery is stored with too low a charge, you run the risk of allowing the charge to drop below the battery's low-voltage threshold, and ending up with an unrecoverably dead battery. Once the charge has dropped to this level, recharging it can be dangerous. An internal safety circuit will therefore open to prevent charging, and the battery will be (for all practical purposes) dead.\n\nIf you already have two Li-ion batteries for a given
468097
Lithium cells are becoming an increasingly important part of portable power sources due to their high energy density and low weight. To fulfill their full potential, lithium cells must overcome several limitations. The most significant of these limitations is the formation of ion gradients in the cell’s electrolyte. Such gradients impede the amount of current that the cell can produce. Overcoming this limitation will allow lithium cells to output an increased amount of current.\n\nBased on earlier studies that have been conducted on lithium / silver salt cells, it was observed that current output depended on electrolyte concentration, viscosity, and the particular anion of the silver salt. From reading and consultation, I have come to focus subsequent studies on the effect of these variables on the formation of ion gradients in these cells as an underlying factor effecting the current output.
143616
Electrons have a rest mass of 9.109 x 10^-31 kg.  Which means they weigh 8.93 x 10^-30 N, which is about 2.01 x 10^-30 lbs.
672976
Are you certain it's not a temperature effect?  Most of the unrechargeable batteries I'm familiar with do have decreased power output at low (like around 40 F or less) temperatures.  I can't think of why a lower ambient pressure would cause the low power.
970178
The weight is about 1140 kg, curb weight that is.  The battery capacity, I don't know if you want to know miles of driving, which I've heard is arround 250 per charge, or this.  6,831 Lithium ion battery cells, about 450 kg, full-charge time of three and a half hours, ~50 kWh capacity.  \n\nAlso, coming in at arround 100,000 dollars, made by Lotus.