Battery doesn't last

I also had the same problem of the battery not lasting a whole round. I found out that if the unit was left for any length of time after it had been fully charged, it would start to discharge even though it was turned off. I now make sure that if I'm playing golf the next day I will put it back on charge overnight.
this has worked successfully for the last 5 months approx
i also looked to find a replacement battery but without success
hope this helps

A laptop won't last long without being charge, a fully charge battery should last about 1hr 30mins so charge the battery while your watching a movie next time.

"Calibrating" a laptop battery is one way to increase the lifespan of a battery that doesn't last long. The procedure involves two steps: fully discharging the battery, then then fully charging it immediately thereafter. It's important to note that a full discharge doesn't mean you drain your battery until your computer powers off, but rather that you deplete it until it reaches a level of approximately 3 percent capacity, according to BatteryCare.com.

1. Charge the laptop battery to 100 percent. Allow the laptop to sit plugged-in and fully-charged for approximately two hours.

2. Click the "Battery" icon in the lower, right corner of the Windows Taskbar and click "More Power Options." Click "Change When the Computer Sleeps," then click "Change Advanced Power Settings."

3. Scroll down to "Battery" and click the "Plus Sign" icon next to it. Click "Critical Battery Level," then click the arrow to decrease the number to "3." Click "Apply," then click "OK."

4. Unplug your laptop and continue using the computer until it reaches 3 percent, at which point it hibernates automatically. Allow the computer to hibernate for at least five hours, then plug it in and allow it to recharge fully.

I hope you find it very helpful. Thank you for using fixya.

hi i have just the same problem did you receive any post with the solution for it? could you let me know?
thanks a lot
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Hello there, the Nintendo DS Lite has four levels of brightness. The battery will last 15-19 hours on the lowest settings, and 5-8 hours on the brightest.This can also vary depending on the type of game activity."
So the DS should last the whole time in even on the highest brightness settings, if fully charged. Nintendo states that it takes 3 hours to fully charge the DS. 

hope this helped, also this site will also help you to get your ds battery to last for longer 

 http://www.ehow.com/how_2015000_extend-b…

good luck

to have a proper full charge is 3 hours even tho the light might go off to indicate its filly charged. have you had it a while because according to nintendo the battery life drops by 25% after 500 charges and so on. you might be as well getting a new battery at around £3 on ebay

You have to replace the battery

hi sir... dont change ur batteries or go for new one... Its becuase the battery pin available in ur mobile device has got damaged... so its unable to store charges for a longer duration...Better give ur mobile for service and they will replace u with new pins.. dont waste in getting new batteries..

thank u rate me!!!

Replace the battery, if laptop works fine from charger without battery installed that proves battery is at fault.

1. totally discharge the battery so it wont come on.

2. Charge the battery fully

3. Reset the player

Now check how long the battery lasts. If it is still 2 hours there is a problem with the battey and you will need to return the player.