you have to clean the battery or change it

it happened to my ds last month and I was sad all the week

then one day i realized that i had to bring it to some place where some one will help my poor ds

they said that it was dirty the connection to the battery and they cleaned it but if my ds turns off again they were going to change the battery

i've imported jump! ultimate stars and Mugen no Frontier: Super Robot Taisen OG Saga