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Hi my Samsung R20 plus laptop is showing battery failure still works ok when plugged in to mains and when i press the test button on the battery it shows all green ie fully charged is it likely to be the battery or a fault in the laptop itself ?

Only way to tell is if you take the power out and run the battery flat. Or put a multi meter on it.

Try turning off laptop.
Remove battery.
Restart laptop.
Shut down laptop.
Battery back in.
Start up again.

See if that changes the status.

Hi Mark have just tried what you said Ie turn off remove battery ect and status came up as battery 92% remaining consider replacing battery . ! I would think from that that it is the battery at fault ?

I think it's worth bearing in mind that the Lithium batteries in laptops and other appliances need a certain amount of babying.

Leaving your laptop in the boot of a car overnight in cold weather, or during a very hot day, is NOT a good thing to do to them. They don't like very low or very high temperatures. Nor should you immediately use or charge them when cold. Try to keep them at room temperature.

Also, if you plan not to use them for a while, make sure you leave them in a charged state. Leaving them for long periods in an uncharged state can destroy them. They will simply refuse to store any energy.

Its not a good thing to overcharge them, either, as this can cause them to overheat and burst into flame! Generally, they or the appliance they are in will contain protection circuitry to prevent this being possible, but personally I would not fully trust this. It, too, can go faulty! Keep an eye on them when charging, and disconnect them when they get to fully charged.

If you have the battery disconnected or removed from the appliance, make sure you don't short circuit them. This can also cause a fire. A friend of mine - a keen model glider pilot - told me of someone who thoughtlessly slipped a battery into a pocket containing keys and small change. The battery became short circuited and before he realised what he'd done, smoke and flames were pouring from his jacket! He was lucky to get out of it without severe burns.

Finally, dispose of them properly. Chucking them in a bin can cause fires down the line. The council provides for their disposal so take them to the waste centre.

I think they are fine if you take a little care, although like all batteries they slowly lose capacity as they age. A fall to perhaps 80% of their original capacity over five years is what you might expect.

Apologies if I am teaching my grandmother to suck eggs, but sadly batteries are not "fit and forget" items. Take a little care for them and they are fine, however.

I have a net book which is loosing charge every day.
It says while plugged in its now only %37 and its been like that for weeks.

The point i'm making is that your answer is down to cost.

If you can live with the laptop plugged in then so be it.
If you need it mobile then all you can do is buy a new battery.

You don't say how old your laptop is as Batteries can half there power in as little as 12 - 18 months.

I would agree from what you have reported back with it "Is more then likely" the battery.

But if you can live with a lead plugged in live with it that way

Hope that helps, its difficult battery's chargers and laptops to pin it down.

Your laptop can live happily with out a battery

Thanks all sorted now got a new battery of ebay now all working as normal happy days !