I own hp 520 laptop for last 18months.... now for last 2 days the battery is not charging n i cannot start my laptop without ac mains on...... after starting my laptop if i switch off mains,it shows batt.at 57% charge n orange light keeps blinking fast......... and i have to switch mains on.

Perhaps remove the multi-bay battery, and let main battery charge all the way. Then reattach multi-bay battery, and see if it's recognized.
(Will charge)

That is AC adapter (Charger) removed, then remove multi-bay battery.
Plug AC adapter back into laptop, THEN plug AC adapter into power.

[You do Not want to unplug an AC adapter from a laptop, with the AC adapter plugged into power. Could be a power surge/voltage spike. Unplug AC adapter from power, when plugging into laptop, or unplugging from laptop ]

Main battery charged, unplug power to AC adapter, unplug AC adapter from laptop. Plug multi-bay battery in, then AC adapter.
(Then plug AC adapter into power)

Post back in a Comment.

Regards,
joecoolvette

You may have a DC connector problem:

Symptoms of a broken power jack
1. If you wiggle the power cord or the AC Adapter connector on the back of the laptop, the power LED and battery charge LED start to flicker.
2. Battery will not charge in the laptop.
3. Laptop runs fine off a charged battery.
4. With the AC Adapter connected the laptop appears to be dead.
No power LED or battery charge LED activity.
5. Laptop randomly powers off without any warning.

If your laptop is out of warranty, then you can fix the problem by re-soldering DC-IN jack on the system board. If it

Hi, It sounds like the battery has come to the end of its life and you will need to replace it.

Most laptop batteries in my opinion only last 18months to 2 years before they need replacement, this is common to most all laptops.

hope this helps.

try leaving on overnight
to charge battery
else may need new ac charger
I know hp chargers only last 2 years of hard use
cheers

Unless you took the batteries to a service center, I am dubious about your ability to confirm the main battery is holding a charge. The average lifespan of these kinds of batteries range between 3-5 years and is likely at the end of its lifespan. This would explain the diminishing performance over the last year if there were significant power or power circuit issues, they would likely be observed on AC power as well. This model of laptop requires the battery calibration utility be run in order for the laptop use the battery. In fact, the battery can show a full charge and still not function if the utility and battery have not been properly configured.. . . instructions on HOW TO do this below. If this doesn't FixYa then the battery will need to be replaced (links to replacement sources) www.BatteriesOvernight.com/HP-Batteries,----- OR --- www.new-laptop-battery.com/Compaq/?Compaq-Armada-E500-battery.htm. You will still have to run the configuration utility when you receive your new battery.
Link to Armada e500 manuals:http://bizsupport2.austin.hp.com/bc/docs/support/SupportManual/c01124216/c01124216.pdf
How to run config utility: Standby and hibernation must be disabled for the battery to discharge completely and shut off. To use the Battery Calibration utility, first identify whether the battery requires calibration by launching the Power Management applet as described above. On the Battery Calibration tab, all installed batteries will be displayed in the primary list box. Next to each battery name will be an indication of whether calibration is required for that battery. If calibration is necessary, the phrase “Needs Calibration” will be displayed. Select the battery to be calibrated, and click the Start Calibration button. During calibration, the utility will display an icon on the Windows System Tray to indicate that calibration is in progress. Each phase of calibration (charging or discharging) will also be displayed. Calibration is complete when the icon is no longer displayed in the System Tray. Battery calibration requires several hours for completion. If you choose to continue using the computer during the calibration process, it must be connected to AC power. The calibration process must be allowed to finish without interruption. Performing any of the following actions will prematurely terminate calibration:
Clicking the Stop Calibrating button in the Compaq Power tab.
Unplugging AC power from the computer.
Unplugging the calibrating battery. (This action may result in data loss if a second battery is not installed.)
Undocking the computer.
Pressing the power or standby button.
Powering down or suspending the machine by using the Windows menu. IMPORTANT: If the calibration process is interrupted, it cannot be resumed. You must restart the computer and start the process again.
CALIBRATING WITHOUT THE UTILITY To calibrate a battery on computers without the battery calibration utility, complete the following steps: 1. Remove the second battery, if present, so that only the battery needing calibration remains in the computer. 2. Dock the computer or connect the computer to AC power. 3. Turn on the computer. 4. Check the current battery capacity level by positioning the cursor over the battery icon in the system tray. 5. Allow the battery to charge to 100%. You may use the computer, but the recharging process will require more time. 6. Set the system to “drain” mode on the battery conservation settings by pressing Fn+F7, or select Start > Settings > Control Panel > Power (or Compaq Power in Windows NT). 7. Undock the computer or disconnect the computer from AC power. 8. Restart the computer in MS-DOS mode by clicking Start > Shut Down > Restart the Computer in MS-DOS Mode > OK. 9. Allow the computer to discharge until it shuts off. 10. Dock the computer or reconnect AC power. 11. Allow the computer to charge again to 100% as in Step 5.

Try your laptop with a good previously checked AC adapter (check the battery charging process). Than try your laptop with another known good battery (with the same good AC adapter). If problem is not yet identified, you should have your laptop checked by a professional : your mainboard might have a problem.

this is ur battery problem so just get ur baterry cheked

You need to purchase a new removable battery for your RX
The removable batts usually only last about a year (like cell phone batteries).
Although it is showing 100% charge, the battery is not storing enough power to run the ipaq

The rx series uses 2 batteries, one is the removable one u can see/access when u remove the back cover. The other batt is a small round batt which stores the basic info for your system (so you don't lose your data when u swap out the removable battery).

This small (backup) batt is similar to the cmos battery on a laptop or pc.
You cannot easily replace this, as the unit needs to be disassembled to access this batt.
If you are tech-y (and brave), the replacement button batteries are sold on ebay for $9-12

Normally, if your removable batt is bad, you could still use your unit plugged in, and could
remove from AC power without losing data. Not the case if your replaceable batt is exhausted.
When both batteries are bad, you lose everything when u remove unit from AC power.

My workaround without having to disassemble unit:
Purchase and fully charge new removable batt (They have huge capacity ones available for like $15 - better than the original !).
Load up all your programs & settings the way you like.
Perform full backup to SD card (& also on PC via active sync - to be safe)
Now the only time you should lose your data (like hard reset) is if you allow the battery
to completely drain, in which case you can restore your backup.
If you purchase 2 removable batts, you can easily swapout without losing data if you
use the usb charge cable & leave ipaq plugged in while you change battery

Hope this helps

Try using your laptop without the battery and just using your power supply (new universal or your old one).
If your laptop works on just mains power it means your battery is causing the problem, which is not unusual.

Hello All;
I used to have these same problems. I replace my BIOS battery, which I know was dead, because all settings get reset when I unplug the power and remove main battery. You might not have to replace it if its still good. Back to the main battery problem, You have a good change of solving this by going into BIOS, and under Tools there is a Battery Calibration option. Do the calibration for the main battery and-or other optional batteries attach and it will most likely solve the problems. This calibration process will take a long time; 1-charge, 2-discharge, 3-recharge, so leave it over night or however.

There was a mention of updating BIOS. This could solve the problem too, because BIOS controls the charging unit. Also, make sure you have Compaq Power Management install on your OS, (download at hp.com).

One note: it will not charge if the battery is about 93% or higher. 93 is not exact, but close to 90%. so test by discharging to below 90% and it will start charging again.

If anyone tries this, leave a post of your success or failure.