A few practical checks can help, but none is perfect on its own.

• Compare the battery and charger closely with Canon’s official product photos/specs.
• Branding matters: a third-party battery or charger often will not carry the Canon logo. If it lacks Canon branding, it’s almost certainly not original.
• Physical feel can differ: one user noted the genuine LP-E8 has a slightly textured/rough surface rather than a smooth finish.
• Weight can be a clue: a noticeably lighter battery is suspicious, though correct weight does not guarantee authenticity.
• Performance is another indicator: fully charge it and compare runtime/capacity against a known genuine battery if possible. A much lower capacity than expected is a warning sign.

Also, “fake” and “third-party” are not always the same thing. Some clone batteries work reasonably well, while others do not. If originality matters, the safest approach is to compare against Canon’s official images and labeling, and buy from an authorized dealer whenever possible.