hi.
1) its not make lower the battery life, but you will recharge the battery more often. in my ds with supercard sd, i recharge it every 6 hours. when i dont use supercard, the ds can play for 10.
2) go to the official site of supercard http://eng.supercard.cn/
CF TO GBA ROMMAN PRODUCTS.
there you can find some e-stores. check them and see
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