YOU SAID:

i went on a walk once, and i found a battery.i didnt know what the battery was for so i kept it to take home with me.

INTO JAPANESE

私は一度散歩に出かけた、そして私はバッテリーを見つけました。

BACK INTO ENGLISH

I went out for a walk once and I found a battery.

INTO JAPANESE

私は一度散歩に出かけて、私はバッテリーを見つけました。

BACK INTO ENGLISH

I went out for a walk once and I found a battery.