Batteries power tablets, terminals, projectors, and puzzle boxes. Watch HUD charge (bottom-left).
| Use | Common mistake | Links | Status |
|---|---|---|---|
| Power tablets / terminals / projectors / red boxes | Running dry mid-puzzle | E-books · Terminals | Verified |
| Reload batteries from inventory (like food) | Forgetting spare batteries in pack | Ch1 | Verified |
| Story unlock in museum basement | Leaving before upper collectibles | Full Charge achievement | Verified |