If it looks stupid but it works, it’s not stupid
The worst thing about batteries is that they don’t last forever. Even rechargeable batteries have a maximum number of recharges before they go kaput. So, if you have any battery tricks up your sleeves, we’d love to hear it.
This is a popular picture that has been shared numerous times on the internet. As you can see, a single battery is powering this wireless mouse, which usually requires two AAs. We don’t know for sure whether this is safe or not, but based on our limited knowledge of batteries and electronics, you should be fine. Don’t try this unless you accept the risk that your mouse will explode.