Another vote for the eneloops. They have much lower discharge rates over standard rechargeables. I bought a pack from Costco for about 30,000 won and it came with the charger, 4 AA, and 2 AAA batteries. The batteries also come in different color sets - blue, green, and white so you won't accidentally mismatch them.
edit: actually it was 6 AA and 4 AAA batteries.