I found my old ds in my closet the other day, with some game in it.

One problem is, i don't have the adapter anymore, so i can't plug it in to the wall.

And it doesnt take your everyday store batters, it's a special battery only the adapter can charge.

Anyway my younger brother wants to play it, any idea on how i would charge it? or can you buy just an adapter from a store?

Thanks.

hook it up to a couple of lemons

LOL'd

it actually works... onion, lemon, pineapple, orange. All those work, though I highly suggest not doing it lol, takes way too long to charge -- just go out and buy an adapter, someone will have it. eebay always works if you can't find any adapters in the store.

something to do with the acidity? explain please

try a local store and if that does not work try eebay/craigslist

there something you can open at the back to adde dbatteries

yes, acid is an electrolyte, you also need two electrodes made of different metal, it's basically like a battery, btw you can try putting those lemon batteries in series, should generate nearly twice the voltage.

Just find one on eebay.

nintendo.com

or go buy one and take the charger then return it.