Dell Inspiron 4000 Battery

I read some info on this about a week ago and thought this might help.
If it is a NIMH battery and the Bios utility is unable to calibrate the battery, it is likely that the settings in the EEPROM chip or the chip itself is bad. I am in the exact opposite position you are in, I can't get a battery calibration to occur, even when draining it to zero. There is a utlity from Dell called Batrcal.com, you could try. If you do a search you should be able to find it. I do not know if it will work with the Dell Inspiron 2600 battery, though. (It seems to not work in mine.) I would put the A05 bios back in, unless you have an issue that was fixed in the later revisions. The a05 does not have a battery health section, only battery state, and when working I got better results with the battery calibrations. Li-ion batterys do not suffer from the memory effect that nimh batteries have because of the eeprom chip that stores full and no charge capacities.

Dell Inspiron 4000 Battery

I guess this is a somewhat common issue. The battery on this Inspiron 2650 I got for free won't charge. Windows says it's charging, but it constantly stays at 0% until eventually it just starts running on AC power, with the battery still at 0%. The charging light flashes indicating it's charging, but if I wait until it says it's on AC power, take out the battery and test it by pushing the buttons on the side, none of them light up.I have a Dell Inspiron 2650 battery, battery lasts about 10 minutes. Are you looking for the voltages at the pins without the battery ??? I usually tap into the connections with wirewrap wire to make pigtail taps. It will tell you what the laptop is providing to the battery pack when it sees a load. I will check this one out with both the battery in and out.

I am having the same problem with my Dell 2650, not charging the battery, I bought a new Dell Genuine Battery and the same condition. I am thinking it might be more than just the battery but i dont have another Dell 2650 laptop to test this battery. I see where you are trying to check the voltage while the battery is plugged in, have you ever tried charging the battery without using the laptop?
I am trying to apply voltage to the battery to see if it will hold a charge (without using the laptop) just to make sure the Dell Inspiron 3800 Battery is ok. but i am not sure which pins to apply voltage to so as not to make the problem worst, do you have any suggestion? I am trying not to have to pull the battery apart.

You either have a bad battery, or an issue on the charging circuit. Try a different battery, although I'd expect to see a higher voltage on one of the battery pins even if the battery is bad. The exception to this is if the computer can't detect the battery. However, you mentioned a charge light coming on, which makes me think that the computer can see the battery. Make sure you are using a genuine Dell power adapter. Sometimes the computer can detect an aftermarket adapter and shut off Dell Inspiron 4000 Battery charging. You shouldn't be using an aftermarket anyway for safety reasons, but that's a topic that's been covered elsewhere. Check for shorted MOSFETs on the charging circuit - I've found that to be a fairly common cause for the battery not charging on laptops.