Fill the battery

Rotate mirrors, redirect energy beams, and route every last drop of power to each cell before the grid flickers out.

You see a battery icon at the top draining in real time. Each level gives you a handful of mirrors, a few fixed conduits, and a grid that needs power. You click a mirror, it spins 90 degrees. The beam hits it, bounces, maybe splits if you line up a teleporter. One wrong angle and you've sent energy into a dead end while the battery ticks down. I spent a solid two minutes on one level convinced the game was broken, then realized I needed to bounce the beam off the back of a mirror that was facing away from me. That's the kind of aha that keeps you locked in. It's not just about connecting dots. You'll need to think ahead because the beam paths can overlap, and a teleporter that isn't exactly aligned will dump your charge into nothing. Some levels have multiple energy sources, so you can't tunnel-vision one path without leaving another cell dark. The difficulty curve is sneaky: early levels teach you the basics, then suddenly you're dealing with crossing beams, tight angles, and mirrors that need to be rotated in a specific order. No two solutions feel the same, and there's a real satisfaction when the whole grid hums alive at once.

Rotate mirrors and use energy teleports to keep the grid functional.

Spin mirrors one step at a time and watch where the beam actually lands before committing. Teleporters can extend a beam across gaps, but they need exact alignment — treat them like angled mirrors. If a node isn't charging, trace the beam backward from it to find where the path breaks. Don't ignore the battery timer; but don't rush either — one clean think is faster than five random clicks. Look for mirrors that can bounce the same beam twice; that trick solves several later levels. Multiple energy sources mean you can't just tunnel-vision one path — check every corner of the grid.

Q: Is Fill the battery free to play? A: Yes, it's completely free in your browser with no paywalls or hidden fees. Q: Do I need to download anything to play Fill the battery? A: No downloads. It runs right in your web browser as an HTML5 game. Q: Can I play Fill the battery on my phone or tablet? A: Yes, the touch controls let you tap mirrors to rotate them, so it works on mobile browsers. Q: Is Fill the battery unblocked at school? A: The unblocked version should bypass typical school filters, but some networks may still block it. Q: What's the main objective in Fill the battery? A: Rotate mirrors and align teleporters so energy beams reach every empty battery cell before time runs out. Q: Do I need a fast internet connection for Fill the battery? A: After it loads, the game runs smoothly on most connections; occasional lag won't break a level.