The problem is that i have a Acer Aspire 5741G laptop whose 9 cell original dell battery which is few days more than 1 year has started to behave real awkward. When i put on the charger it charges the battery upto a certain level and then the battery led signal above keyboard starts to glow 4 times red and one time white and the status says under temporary failure mode. After I remove the charger and wait for 10 min approx the battery comes under normal condition. The main problem is this level until it charges is decreasing and has come down to 73 % now. What should i do?Should I buy a new one online,like: http://www.bateriabaratos.com/acer-aspire-5741g.html ?

Only a year old? Most likely one cell has failed - it will likely be at 0V or have high ESR. If you are good with tools you can replace it like here:

http://www.linuxjournal.com/content/...laptop-battery