These are the details from my problem laptop
Hardware monitor Battery
Voltage 0 3.26 Volts [0xCBC] (Current Voltage)
Capacity 0 48400 mWh [0xBD10] (Designed Capacity)
Capacity 1 32362 mWh [0x7E6A] (Full Charge Capacity)
Capacity 2 n.a. [0x0] (Current Capacity)
Level 0 34 pc [0x42] (Wear Level)
Level 1 n.a. [0x0] (Charge Level)

and these are the ones from a working laptop

Hardware monitor Battery
Voltage 0 11.43 Volts [0x2CA9] (Current Voltage)
Capacity 0 24420 mWh [0x5F64] (Designed Capacity)
Capacity 1 22056 mWh [0x5628] (Full Charge Capacity)
Capacity 2 799 mWh [0x31F] (Current Capacity)
Level 0 10 pc [0x5A] (Wear Level)
Level 1 4 pc [0x3] (Charge Level)

The Charge level merely shows how much the battery is currently charged, on a working laptop this will slowly go up to 100% then stay there

The only obvious thing I can see is that on the non charging laptop the voltage is very very low - 3V, so obviously somethign wrong just not sure if its teh charging circuit or the battery

Its only 2 years old max, but hasnt been used for about 7-8 months.

As soon as you pull the plug it goes off.

The battery light on the front of the laptop comes on as if to indicate its charging and it goes off if I take the battery out. I cant verify the exact behaviour of the light though as it is not mentioned in the manual I got from the Asus website

What does it say for your battery voltage for bothe new and old battery?

In reply to a post by slippyjim:

What does it say for your battery voltage for bothe new and old battery?

New battery voltage 11.99v
Old battery voltage 11.94v
On the Dell the power light will flicker when the old battery is installed indicating it is flat as a pan cake! It does not flicker when the new battery is inserted as it has a costant 2% charge after 6 hours now! I shall leave the laptop charging over night to see if there is any difference and post back tomorrow!
Judging by the current voltage of both my batteries 11.99 and 11.94, they should be ok, whilst the battery in your problem laptop only shows 3.26v which could indicate that in your case it is the battery which is faulty and in my case it is the battery charging circuit in the Dell that is obsolete!

Edited by deleted (Wed 19-Sep-12 01:04:27)

My battery says Current Voltage 12.49 V and I don't remember it saying anything other than 12 V.

After more than twelve hours on charge, the new battery still registers;
Current Voltage 12v 12v 12v
Designed Capacity 32560 mWh 32560 mWh 32560 mWh
Full Charge Capacity 32516 mWh 32516 mWh 32516 mWh
Current Capacity 858 mWh 858 mWh 858 mWh
Wear Level 1 % 1% 1 %
Charge Level 2 % 2 % 2 %
I don�t think the charge will ever improve, I�ll just have to use the laptop connected to the mains only!

I had sme problem on my insprion 1520 bought new battery still wont charge bought new charger problem solved

In reply to a post by BatBoy:

In reply to a post by flippery:

Lithium batteries need regular cycling from full to empty. Otherwise they can become resistant to charging.

This advice is incorrect. The lifetime of a Liion battery is measured in charge cycles, a cycle being going from full to empty. Your advice would shorten the life of a Liion battery.

Certainly on first use it is recommended to discharge and fully charge 4 or 5 times in succession - manufacturers instructions. After that it is advised (again by manufacturers) that you do this cycle occasionally (ambiguous).
As stated already though doing this constantly reduces the overall life cycle.

Have you checked that the battery is not loose and that all of the connectios are being made?

In reply to a post by drummerjohn:

Certainly on first use it is recommended to discharge and fully charge 4 or 5 times in succession - manufacturers instructions. After that it is advised (again by manufacturers) that you do this cycle occasionally (ambiguous).

This too is incorrect. See here for example http://gemini-lights.com/explore/how-charge-lithium-...