Does a battery, fully charge weight more than a empty one?
815037
In fact, the answer to this question is YES. (Sort of)\n\nHere's why:\nEinstein's famous equation says that e=mc2. In other words, energy and mass are fundamentally linked (by the square of the speed of light, which is a very big number). When you put energy in to a dead battery, that is equivalent to putting in a tiny, tiny, tiny extra amount of mass. I doubt any set of weighing scales on the planet would be able to detect the difference it makes to your average AA however! \n\nFor all practical purposes though, provided your battery is a closed system and airtight, a charged battery has no more or less mass than a discharged one.
721773
Yes, it does. A negatively charged object is heavier than a positive one. However, this difference is amazingly small that it's hard to even comprehend let alone measure.\n\nEDIT: To the guy below me, although the positron is a recognised particle they do not magically appear to replace a lost electron - a positive object is lighter. See link for a workthrough and proof.
444213
Wow, there seems to be some differences of opinion on this one. Well perhaps I can help clear up some of the mystery.  I have actually done quite a bit of research on this topic.\n\nThere is this thing called "battery memory".  It doesn't actually have anything to do with memory, what it refers to is the battery's ability to hold a charge.  If a battery is not discharged all the way before it is recharged it starts to develop a "memory" of the amount of discharge. It doesn't happen right away but eventually it gets to the point where the battery will no longer charge to the full capacity it used to have.\nDifferent battery types are effected by this different amounts.  Alkaline batteries are severely effected by it. Lithium Ion batteries (the kind in a laptop) are not nearly as effected by it but are still a little effected.\nThere is something else to consider however.  All batteries, especially lithium Ions and most especially cheap lithium Ions loose there charge over time, even when they are just sitting being unused.  This means that every few hours or even every few minutes depending on your battery and laptop, the battery charger kicks on to get the battery back to 100%.  This rapid charging and discharging will quickly hurt the batteries life.\nOf course this is only one of many things that can and will effect the life of your battery.  The manual to your laptop should have care instructions for it.  Usually it recommends running on the battery and draining it completely dead then doing a full recharge around once a month.  This will help stop "battery memory".
913372
It doesn't really have one. Its just a useful way of characterising the battery's behaviour.\n\nBatteries approximate to perfect voltage sources - in other words, the voltage across them does not drop no matter how much current you draw. (By contrast, solar cells approximate to perfect current sources).\n\nOf course, in reality the voltage does drop a little, and drops more the more current is drawn. The relationship is almost a straight line for small currents, and so it is useful to know the rate the voltage drops as the current increases, or dV/dI. Now of course the units of volts/amps is ohms.\n\nWhere this relationship is linear (small currents) you can also usefully include the internal resistance as a fictitious resitance in a circuit - it will do just as well as accounting for the change in voltage (can you see why?).
365913
i was told when i took mine in that after about 400 charges that it would lose about %80 if its power and then go downhill after that. i know that you can get it replaced for not a ridiculous amount of money.
580265
Depends how long have you had it ?\n\nAnd your operation habits \ndo u normally charge it while its half empty ?\nare you always using it on ac power or battery power , i work in a company where we have 30 laptops the same brands and the time varies.\n\nalways charge it when its empty only and if u have a power source try removing the battery .\n\nthese things increase the life time of the battery....
465838
Well, NiCd and NiMH batteries can be charged and stop charging at full charge without the help of some device to determine if it's full. Once the NiCd and NiMH is full, the current will just pass through and waste your electricity (and if it's left charging at full charge for extended periods, it can also damage the batteries). So it doesn't actually disconnect the current. Just passes through.\n\nBut in Lithium ion batteries, you need some kind of device to determine if it's fully charged. Cellphones, PDA, and iPods kinds of turn on (like, it shows the charging display, but it's not actually on and in your normal thing) when it's plugged into a current so it can detect if it's fully charged. So basically, the device is the mini-computer that determines the charge of the battery.\n\nSo, to answer your question, don't try to create a circuit that will disconnect the current when a Lithium Ion battery becomes fully charged, unless you have the capability, materials, time, and patience to do it. And steady hands. It's really tricky to build a Lithium Ion Battery charger.\n\nPS Penguins!!!
250746
This is the best answer you'll get -\nhttp://electronics.howstuffworks.com/battery.html
500850
Rechargable batteries can only handle a certain number of charge discharge cycles so if you discharge the battery before charging it you will actually shorten the life of the battery as opposed to simply charging it when you get a chance.
207368
there is a software called "accumulator training utility". this utility calibrate the "smart chipset" of a notebook battery.\nit does not work for defective batteries, for older and apple notebooks.\n\nhave a look for this utility on ebay in the category notebook batteries.\n\nin my humble opinion this utility is crap, but could work for batteries that have been always decharged only to 50% before recharging again.
1078524
I once read about a device with which reconditioning may be achieved 90% of the time on some types of batteries by applying a very brief, high voltage pulse (kinda like a camera's flash system) across the terminals of individual rechargeable cells.  I tried an improvised version of it with NiCD and sealed lead batteries, and it seemed to work most of the time.  I couldn't find plans for the device when I searched just now, though, so I can't really tell you more than that.  Unless you're knowledgeable in the field of electronics, I suggest you just get another battery because the method of recycling I just described may be dangerous.
1156803
if you want to charge, but it can also be plugged when not using. most of the rechargeable batteries today use NiCd or NiMH, so it can automatic stop charging and it can charge the battery even it is half empty. not like batteries before that you must discharge it first before charging it.
999688
Yes.   Piece of piss.   You only use a mower about 1% of the time at most, so even a fairly small solar panel should be able to keep it charged.   Just check that the panel's output voltage matches that of the batteries.
985659
Its better u plugged ur battery out...!\nEvery battery has LifeTimer..! when u left it plugged in, it will decrease its LifeCycle. \nTo ensure lasting ur battery, from time to time, try to charge it nearly 8hrs without turning on ur LapTop.!\nenjoy it ;)
878972
You can actually conduct a simple test on your battery. Leave the laptop on for about half and hour and after charging fully. See if the battery drains fast. If yes then you have to change your battery. Is yours a new note-book or seasoned one. If new then you can actually contact your vendor and inform him and see what he can do for you.
35492
You can't really get an accurate result with a multitester.  NiMH batteries have a fairly flat discharge curve with a sudden drop-off when they're discharged.  Like all batteries, if they’re measured open-circuit (no load), they will also display a higher voltage that will immediately drop when placed under load.  \n\nMeasuring NiMH battery voltage to determine charge levels means that you have to be able to be able to measure down to .01 or 0.001 volts under load to get an idea for how charged the battery is.  Even this method will only give you a relative result, since NiMH batteries lose capacity for each charge/discharge cycle they go through.  A fully charged battery after 200 uses may only have 90% capacity.\n\nBattery chargers for the newer battery technologies like NiMH or Li-Ion typically use several different methods at the same time when charging batteries:\n\n - Time (14 hrs) \n - Temperature (gets hot when fully charged)\n - Voltage (peaks when charged)\n - Charging current (drops when fully charged)\n\nNiMH batteries only provide about 1.2V VS 1.5V in an alkaline abttery.  A measurded no-load voltage on the battery of 1.5 volts is probably ovr 50% charge.
452810
No, it's not true. You'll destroy your charger. \nAlkaline batteries are not designed to be charged.