If your Nintendo ds wont turn off what should you do?

I can only think of 2 possible soloutions.

The first one:

Charge your DS, using your Power Adapter (Which came with your package)

OR:

If the DS Still won't turn on, you should consider buying another compatible battery, these can be bought from the internet and game shops.

Example DS Battery:

Amazon.co.uk/Nintendo-DS-Compatible-Battery-850mAh/dp/B000LRT4JA">http://www.Amazon.co.uk/Nintendo-DS-Compatible-Battery-850mAh/dp/B000LRT4JA

Example DS Lite Battery:

http://www.Amazon.co.uk/Nintendo-DS-LITE-Replacement-Battery-Capacity/dp/B000VO6W5M

Example DSi Battery:

http://www.batteryupgrade.co.uk/shopBrowser.php?assortmentProductId=37421125&shopGroupId=21635566&tracker=googleProducts_uk#/assortmentProductId/37421125/shopGroupId/21635566