nx9420: Dead battery, what now?

The battery is dead after 2.5 years. Charge it for a day, remove the power cord and the laptop won't start.

I don't know if I should go for a new battery or new cells? What do you think?

Also, how do I open the battery the easiest way? I'd like to see if someone else have done it before I do, I guess there's a lot of glue in it that makes it difficult to open.

 

Get a new battery... Soldering greatly decreases the capacity of Li-Ion cells (they don't like heat), so unless you got one of those fancy little point welding machines, you'll do more harm than good with new cells.

Oh and when you get a new battery, don't leave it in the laptop when it's on AC.

 

Thanks for the reply!

I have used my laptop connected to AC a lot, but I removed the battery for longer periods, many times with about 40-50 % power. And still, it's completely dead after such short time.
Right before it died it was good for at least 90 minutes. I don't get it.

But, the it acted really strange in the end. It worked as expected down to about 60%, then suddently it dropped down to 0%! I disabled the auto power down, and it kept on running for another hour. I tried recalibrate it, but no luck.
Now is this normal behaviour for a dying battery?
HP battery utility tells me to ge a new one. .

 

Yeah it is normal behaviour, one of the cells has gone bad and no longer delivers the needed voltage, which causes the whole thing to fail since some of the cells are in series. The one in my DV9000 sometimes drops from 20% to 6%, but i have found that to happen more and more seldom lately. Guess my battery heals itself.

 

At two and a half years old you got your monies worth. However, there's no way to be sure what made your battery die. There is a possibility that you storage method were off. Li-ion battery have the capacity to be stored for a long time while maintaining their charge. However, it is still a good idea to use them after a few months down to recharge level then recharge them partially or full before storage again. If during storage the battery drops below it's minimum set recharge point, it will not be able to be recharged again.

 

Oh yes it can... But not in the laptop indeed.

 

What?

 

What i wanted to say is that there are ways of charging a battery that has fallen below cutoff point.

I've walked someone through recharging a seemingly dead Creative Zen battery after the device was kept in a drawer for 6 months. That was about an year ago and as far as i know that Zen is still chugging along.

 

Thank you for your help!
Now I guess I know what happened. After calibrating, I never turned on the "auto turn off computer", which made the battery go empty everal times.
I guess I can blame myself a bit, but it would die pretty soon anyway.

The battery was never detached for more than maybe 6 weeks.

Soldering can't be that much of a problem if I buy batteries with pre-soldered cables.

 

The problem is that they'll have to fit really tight. I don't think you'll have any room to fit the cables...