dv2000t battery problem - please help!

I use my dv2000t notebook virtually every day, and it is usually plugged in. I use the battery maybe once per week.

Every 10 days or so, despite the battery being at 100% in my previous day's use, it suddenly drops to 95% or so. This concerns me greatly - are the battery cells being destroyed? How can a 5% discharge occur overnight? I do notice that the battery life is weaker than, say, 4 months ago.

This is really confusing. I take good care of my notebook. Could anyone offer any tips or ideas to solve this problem or at least determine the cause?

Thanks everyone.

 

If you plug the power cord and leave it in the outlet all the time, that will definitely reduce battery life. But if you plug the power cord into the ac outlet only until the charge completes, and then unplug the power cord, the battery will be prolong.

 

The cord is in the outlet only when the notebook is on. I don't want to always use the battery, which is why I plug in during use normally. I think you may be suggesting I use the battery whenever it is fully charged, but I don't have a need for that.

If I remove the battery once the charging is complete, isn't it also threatening to battery life?

 

Please read the battery guide.

 

Plugging the ac into the outlet does more harm than good to the battery. I never plug into the ac adapter or leave it plug all the time. If you take out the battery and run it straight from the outlet, it doesn't reduce battery life because it's not being charged.

 

hmm the guides alright, but see, the cycle count varies greatly, that 300 to 800 figure is complete charge discharge cycles. Lion chemistries are a little more complex than just a straight linear relationship between usage and age. The battery greatly is impacted by percent discharged, for example, if you discharge only to 95%, then your cycle count increases exponentially, if you go all the way down, it decreases exponentially. I personally beleive that going to such drastic measures as removing the battery from the notebook is not needed unless if it is only on your desk.

 

I've read the battery guide, and in order to remove the battery I'm supposed to discharge to 40% left. According to the guide leaving the battery in the notebook while on AC power should only reduce the # charge cycles and not the charge capacity itself.

I used to remove the battery while on AC power but again found that every now and then it had discharged 5% or so. The discharge is never 1 or 2% - it's either 5% or none at all. This is also the case with my current situation.

Thanks to everyone for their responses. I'm enjoying this discussion!