Okay, so have you ever seen a jelly roll before? It's like a yummy treat that looks like a rolled up mat. Well, there's something called a jelly roll battery that's kind of like that too.
A jelly roll battery is made up of thin, flat sheets of metal and a special jelly-like substance. The metal sheets are rolled up super tight, just like a jelly roll, and put inside a little canister.
The jelly inside the battery is kind of like a glue that helps hold everything together. It also helps keep the battery working by letting electricity flow through it.
When you use a jelly roll battery in a device like a flashlight or a toy, the electricity flows from the metal sheets through the jelly and then out of the battery to power the device.
And that's basically how a jelly roll battery works! It's just like a yummy treat, but instead of tasting good, it makes our toys and gadgets work.