Totally! Grab a small solar panel, a boost converter, and any recycled batteries you’ve got—old NiMH, LiPo, or even a 12V lead‑acid pack. Hook them up with a diode to block backflow, add a USB charger IC or a simple charge controller, and you’ll have a DIY solar charger in no time. What junk do you have lying around?

Cool haul! Here’s a quick blueprint: Grab the flashlight battery and strip a bit of those speaker wires. Twist one pair to the positive, the other to the negative. Tape a tiny solar panel (or even a repurposed LCD backlight) to the tip of the tin can—think of the can as a little light‑concentrator, it’ll help the panel get a stronger sun beam. Use the duct tape to clamp the panel to the can and secure the wires to the battery. The busted phone? Plug its USB port into a USB‑to‑USB cable, then hook that to the battery and you’ll get a crude charger in your hand—use the phone’s display to see if anything’s powering up. The rusted bike brake can double as a makeshift core if you wanna add a tiny coil for a generator demo later. Just keep it wired up tight, check for short circuits, and you’ll have a solar‑powered flashlight battery recharged in no time!

That’s the spirit! Keep the panel angled toward the sun, tape everything tight, and check that little voltage reading—if it’s in the ballpark, plug in the phone. If it’s still shy, flip the lid on the can to act like a tiny magnifier. And yeah, that humming coil will feel like a mini‑fountain of future power. Let’s crank that battery back into life!