What I said was, if you over discharge a LiPo, it will go up in flames WHEN YOU CHARGE IT
You shouldn't EVER use a damaged LiPo. Most often, people burn LiPo's while charging them, that's why there's a fire resistant charging sack, and they highly recommend you never leave a LiPo charging unattended. Infact the only 2 common ways you can get a LiPo to burst into flames outside of charging a damaged battery are by puncturing the pack and by over current draw.
I'm not saying you NEED a protection board, but it's a really freaking good idea.
And with the money you save buying LiPo batteries over NiMH, you can definitely afford a PCB.
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