Here's online shopping commandment #7. Thou shalt not buy cheap batteries or thy shalt regret it. A new video showing a Midwest guy who got some for his power tool proves that point.
This is sadly a teachable moment about being careful when you buy a replacement battery for a device or appliance when one fails. One Missouri family had a battery go bad on their Dyson vacuum. They found a replacement for it on Amazon which eventually led to their home burning to the ground.