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Re: battery not getting charged
Hi there This is a common problem with laptops, you will need to have the battery checked as it could be damaged and needs replacing. Alternatively it could be the motherboard or the power supply itself which is faulty
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Rechargeable batteries, especially the Nickel-Cadmium type (NiCad) suffer from a phenomenon known as "memory". If they are routinely discharged only partially then put back on charge they will eventually "remember" this duty cycle and work only a few minutes before needing to be recharged. This can sometimes be reversed, but doing so is not always easy. The newer NiMh (Nickel Metal-Hydride) batteries have mostly overcome this problem, but shallow-cycling your rechargeable batteries is still not a good idea. It's also a possibility that your batteries are worn out and need to be replaced. Rechargeable batteries can only be recharged a certain number of times before they go bad. With top quality batteries and a proper charge/discharge cycle, you can occasionally get up to 1000 charge/discharge cycles out of them. With so much of this stuff coming from China these days it is becoming increasingly difficult to find really good rechargeable batteries.
If these are lead-acid batteries, then the symptom you describe indicates that replacement is likely needed.
If the laptop battery is more than 3 - 4 years old then the battery could be worn out. Rechargeable batteries have a finite number of charge and discharge cycles and will lose their charge capacity over time, i.e. won't charge to 100% and gradually the charge reduces until the battery won't charge up at all. OR The battery shows a 100% charge but when the adapter is disconnected the battery drops off to zero capacity in a very short time. If the battery drops to an unacceptable charge level then the battery needs to be replaced. Rechargeable batteries will fail if stored in a discharged state for long periods.
as i do not know what laptop we are talking about here i asume its not a notebook if it is the time is slightly lower (6-8 hours) a normal lap top 10 - 12 hours. some super batery laptops come with an own (long) guide how to keep the batery alive.
to keep the batery alive a long period of time charge it from 50% not when its at critical.
If u can take out the batery when you are using cable and its fully charged it also has a longer life time. or just take out the cable when its at 100% and recharge it when it gets to 50%
dont have your computer in the lap it can over heat the computer/batery and the lifte time gets even lower.
Since most newer lap tops and note books use Li-ion batteries, they (the BatteryPack) have a built in chip to keep the charger from over charging a depleted battery, one that has locked itself from being charged. This is a safety feature to prevent a fire from a hot battery that may be overcharged. This feature locks the battery when the internal resistance gets too high and the battery pack falls below 3 volts per cell.
Try this for laughs, take the battery out of the lap top and put it in your freezer for about an hour and then place it back in your machine and see if it will begin to charge. This works sometimes as the cold slows the charging down to where the battery may recover. However, it will still be a low use battery as over time they loose the ability to be recharged to a full 100%
The worst is that you may have to buy another battery. If you do avoid buying used batteries as some one else is trying to sell you their problem.
the battery sounds like it has bad battery memory and needs to be replaced. Before you replace it look for software to give you the battery's status (how much charge it holds out of how much it should hold by design. for exaple i am using ubuntu linux and my battery reads
Capacity: 29% (Poor) Current charge: 14.3 Wh Last full charge: 14.3 Wh Design charge: 48.8 Wh Charge rate: 10.0 W
now that is my bad battery for staying at home and leaving it plugged in all the time (that kills the battery) i have another battery that reads
Capacity: 97% (Good) Current charge: 38.8 Wh Last full charge: 47.5 Wh Design charge: 48.8 Wh Charge rate: 5.5 W
it is my battery for travel. the difference between the two is that the battery that reads Capacity: 29% (Poor) only lasts about 40 minutes but the battery that reads Capacity: 97% (Good) lasts 3 hours. you probably have a low Capacity.
It could be one of three things. It could be a bad battery, a bad ac adapter, or the recharging circuitry could be bad. I would try pulling the battery out, and see if the laptop will startup and run strictly off of the ac adapter. If that does not work, you have a bad ac adapter. If that works, and the battery has any charge left, try running it strictly on the battery. If it doesnt work, you have a bad battery. If it does work, the circuitry is bad and you will probably need new motherboard. One other thing you can check is where the ac adapter and battery plug into the laptop, and make sure there is no corrosion that could be causing a short.