I am having a problem with my toshiba laptop battery.when i plug in the power source it starts charging which? is indicated by a red light.after some time (not every time i plug in) the red light goes off and it stops charging...then i have to replug the power source to restart charging.the same situation may arise even after repluging......what can be the possible problem and what can be its possible solution.....awaiting for reply.........

Try this:

Disconnect the battery from the laptop; Plug in the AC power cable, try turning on the laptop again.

It SHOULD power up and continue to boot into windows like normal.

If it does, now put the battery into the laptop while the laptop is on.

Make sure in windows you see that the battery is charging.

If it is, then the battery was to depleted on energy to start the laptop; Some laptop batterys have to have a minimum charge in order to start the laptops. Even if the power cable is plugged in.

please see the commentary. God bless you

• 
  The majority of laptops will display a solid green, blue or purple battery light to indicate that the battery is fully charged. Most manufacturers indicate that a laptop is in the process of charging by displaying a solid or blinking green, orange, blue or purple light. If your battery indicator light is green, blue or purple, the battery is probably functional, regardless of whether the light is blinking. If the light is solid orange, the laptop is probably in the process of charging.
  
  

Battery Error Coneventions

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  Many battery manufacturers use rapidly blinking lights to indicate that a battery's charge level is low. In general, a laptop will rapidly blink orange or red when its charge drops below a certain level until the computer is plugged into a power outlet and charged. If your laptop's battery indicator continues to blink rapidly in orange or red or if it remains red even when it is plugged into the charger, it indicates a problem with your battery or the charger.
  
  

Read more: http://www.ehow.com/info_12183593_blinking-battery-light-laptop-mean-charger-not-charging.html#ixzz2fu5qhEWg

please read and execute the commentaries. God bless you
Charging Conventions

• 
  The majority of laptops will display a solid green, blue or purple battery light to indicate that the battery is fully charged. Most manufacturers indicate that a laptop is in the process of charging by displaying a solid or blinking green, orange, blue or purple light. If your battery indicator light is green, blue or purple, the battery is probably functional, regardless of whether the light is blinking. If the light is solid orange, the laptop is probably in the process of charging.
  
  

Battery Error Coneventions

• 
  Many battery manufacturers use rapidly blinking lights to indicate that a battery's charge level is low. In general, a laptop will rapidly blink orange or red when its charge drops below a certain level until the computer is plugged into a power outlet and charged. If your laptop's battery indicator continues to blink rapidly in orange or red or if it remains red even when it is plugged into the charger, it indicates a problem with your battery or the charger.
  
  

remove the battery pack and power source. make sure nothing is plugged into the laptop. hold down on the power button for 30 seconds. then reinstall battery, plug the the adapter into a known live power source (the real reason for your problem) and power it up!

Red battery light means battery is charging. It should start up even if battery is low. Try pressing on the area above and to the right of the power button, while you are pressing the actual power button.

Yes it is, seems there is some problem with the power state detection and changing of the load mode. Might by a physical problem, so I am not sure you can fix it.
At least check your power plan details and see if there is any error with the ACPI devices in the device manager.
In general, if you use the laptop when plugged, you should take out the battery to maximize the battery life (prevents useless load cycles).
Also configure Windows to optimize battery usage.

It sounds like the power socket on the laptop is faulty and needs replacing or resoldering. To check this, power up the latop with the power adapter, wriggle the plug in the power socket and check if the battery charge indicator flicks on and off indicating charging and not charging. If it indicator flicks on and off then you have a faulty power socket.
This can be repaired but required the laptop to be completely dismantled to access the power connector.

Change your AC charger.
It's NOT charging "When the laptop is plugged into the AC, the power meter in windows tells me that the power source is still batteries, and the battery level drops by about 1% every few hours"
That's the reason why: "battery has completely died"
If you do not change it you'll continue to "still it gives me the same low battery indication and will not turn on. "

Charge the Battery fully before first use . The red flashing indicator shows that the battery has been deeply or fully discharged . Please Connect your laptop to AC power source and let it remain for well over 10 hours atleast.If the battery pack is alive it might recover and start working normally.

Your battery not able to hold a charge is a bad battery.
Love your precise description & diagnoses. Wish others would describe their troubles as well as you!

Have a great day!