Battery Problem

Depending on how old the batteries are they may be shot. Lithium ion laptop batteries only last about 3 years no matter how many times they have been charged and discharged.

If the batteries are fairly new you may have a problem with your charger/adapter.

If you decide to replace the battery do a search for "replacement laptop battery" on Google. You will get dozens of sites that sell replacements. They usually offer a tool where you type in the make and model of your laptop and they will tell you the replacement you need. Very simple. Be aware that a replacement will usually cost from $100 to $200.

Depending on how old your laptop is it might be more cost effective to buy a new laptop for when you need portability. I see pretty decent laptops online for $500 all the time. You can always keep your old one as a second computer for a child, or sell it on eBay for cheap.