Corrected (formal): The batteries installed in the book are for demonstration only. For proper operation, we recommend replacing them with new batteries.
Child-friendly (for a 6-year-old): The batteries in this book are just to show how it works. To make it work well, please put in new batteries.
- Original meaning: The message says the batteries that come in the book are only there to show how the book works, and you should put in new ones so the book works properly.
- Why we changed "intended solely for demonstration purposes": That phrase is long and uses big words. "For demonstration only" says the same thing but is shorter and clearer.
- Why we changed "it is recommended to replace them with new ones": Passive phrasing like "it is recommended" is wordy. "We recommend replacing them" or "please replace them" is clearer. For a child, "please put in new batteries" is simplest.
- Why we used "new batteries" instead of "new ones": Saying "new batteries" is clearer for young children who might not know what "ones" refers to.
Short tip: Use short, clear words for signs or instructions, especially when children will read them.