Laptop battery


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harmy

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Help.

do i need a new laptop battery?

had laptop two years and unless i leave power cord plugged in the battery dies after only 25 - 30 minutes.

i can charge the battery to full and it still only last that long.
 
Help.

do i need a new laptop battery?

had laptop two years and unless i leave power cord plugged in the battery dies after only 25 - 30 minutes.

i can charge the battery to full and it still only last that long.

Someone told me (Hauser) that if you are using your laptop when the power is connected you should unplug the battery as it is being constantly charged and they only have the capacity to be charged so many times.

So if this theory is correct then, yes you need a new battery.
 
Ive had my laptop since 2009 and Ive already replaced one battery , and it now needs another one. IIRC their useful life is approx. 12 months.
 
Someone told me (Hauser) that if you are using your laptop when the power is connected you should unplug the battery as it is being constantly charged and they only have the capacity to be charged so many times.

So if this theory is correct then, yes you need a new battery.

Hauser must buy shite then - any laptop worth its salt will let you control whether charging occurs when on mains power. ;)

Actually the battery isn't being continuously charged anyway. On mains you're getting power straight from the power supply. The battery will also get some if it needs charging.

The problem then is that lithium ion cells don't like being stored when fully charged, which is effectively what you're doing when it reaches full charge. You should always store them half charged.

So, if you use your laptop mainly on AC power, and it doesn't have the option mentioned above, it's a good idea to run the battery down to half charge, and then either:

1) take it out, or

2) swap it with an older one.

OP: if you get a new one, keep your old one and use it per 2) above. It'll hold some charge for ages yet, which gives you a UPS for your laptop and some protection if your lass trips over the power cord and pulls it out. Though not from your lass obviously.
 
You have to charge it then use it to empty then charge it again. Lithium(sp) batterys if fed off a charge will become lazy
 
Hauser must buy shite then - any laptop worth its salt will let you control whether charging occurs when on mains power. ;)

Actually the battery isn't being continuously charged anyway. On mains you're getting power straight from the power supply. The battery will also get some if it needs charging.

The problem then is that lithium ion cells don't like being stored when fully charged, which is effectively what you're doing when it reaches full charge. You should always store them half charged.

So, if you use your laptop mainly on AC power, and it doesn't have the option mentioned above, it's a good idea to run the battery down to half charge, and then either:

1) take it out, or

2) swap it with an older one.

OP: if you get a new one, keep your old one and use it per 2) above. It'll hold some charge for ages yet, which gives you a UPS for your laptop and some protection if your lass trips over the power cord and pulls it out. Though not from your lass obviously.



You're just bitter cos The Helmet has a better monitor than you
 
Doesn't apply to lithium ion batteries.


Correct.

The memory effect doesn't even exist as such. It referred to NiCad cells. What was actually happening was users were topping up the batteries in primitive timed chargers and overcharging them, reducing their lifespan. Any decent, modern charger (ie Delta-V) can safely top up cells without overcharge.

Lithium Ion batteries in laptops are always smart-charged. They get the amount of charge they need and no more.

You're right about storage as well. Approx half charge is ideal storage conditions.
 
Power supplies compare the battery voltage with the charging input. Charging is controlled automatically, as the voltage rises to the point of being fully charged the circuit cuts off charging from the mains, it's the same in any charging ciruit these days. It doesn't matter if the mains lead is plugged in or not.

I have a Toshiba Satellite and I have noticed that I have suddenly started to get just over and hour from a fully charged battery, it's three years old, so it's getting near it's time. I also have a friend whose battery was suspected, I found that the charger was working intermittently, a broken wire on the 19 volt side (there are only two wires in this lead, the one in the centre, and the one that is also the screen around the outside) easy to fix if you're carefull.
 
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Power supplies compare the battery voltage with the charging input. Charging is controlled automatically, as the voltage rises to the point of being fully charged the circuit cuts off charging from the mains, it's the same in any charging ciruit these days. It doesn't matter if the mains lead is plugged in or not.

I have a Toshiba Satellite and I have noticed that I have suddenly started to get just over and hour from a fully charged battery, it's three years old, so it's getting near it's time. I also have a friend whose battery was suspected, I found that the charger was working intermittently, a broken wire on the 19 volt side (there are only two wires in this lead, the one in the centre, and the one that is also the screen around the outside) easy to fix if you're carefull.

You're basically right, but if I may be pedantic (when am I not?) - the charging circuit is built into the laptop's logic board or the battery itself. The power supply/adapter merely supplies a stable, constant 19VDC, it plays no part in the charge control/cutoff, nor is it 'aware' of the battery state. Smart batteries use microcontrollers embedded inside them to precisely control charging. The controller knows how much charge to put into the battery to return it to full capacity. It can also predict run time as the battery ages.

Incidentally, the vast majority of laptop adapter faults seem to be as you describe - broken wires. Especially around the flex point at the 19V plug.
 
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