Any tips ion increasing the life of my laptop?

[Durdle]

I have a fairly new laptop- bought about a year ago and the battery is rubbish! I have just switched it on (after charging it all night) and there's about 40mins of power left. I really want to get wireless internet but there's no point if I have to be plugged into the power source all the time! Someone suggested putting it in the freezer which I did but didn't seem to make any difference. Anyone got any tips or should I just bite the bullet and buy a new battery??????

Just bumping this really!
My laptop works for about 30 mins on full charge.

New battery. I think a year is pretty good going, tbh, ours didn't last that long. Have run it off the mains since Forever. I think if you care for them exactly according to instructions they might manage a whole 14 months or so...

Mine only does about 45mins was thinking about this yesterday.Mine also runs slower on battery power is that normal?

Mine does about 5 mins at around 4 years old! Also have to keep opning and closing the disc drve during start up to remind it it is alive! Poor thing. Laptops just don't seem to have the life span of desk tops and battries are always th first thing to go I'm afraid.