Why do batteries lose charge over time?
Show answer & explanation
Answer: Self-discharge from side reactions
Electricity slowly leaks out — Wrong. Electricity doesn't leak out. Batteries discharge through internal chemical reactions that occur even when not connected to devices.
Temperature degrades materials — Wrong. Temperature accelerates degradation, but batteries discharge even at room temperature due to unavoidable side reactions consuming charge.
Self-discharge from side reactions ✓ — Correct! Batteries self-discharge through unwanted chemical side reactions. Even unused batteries have ions moving internally, consuming stored energy. Rechargeable batteries (lithium-ion, NiMH) typically lose 1-5% per month. Heat accelerates this. Lower temperatures slow it—storing batteries in cool (not freezing) places helps preserve charge!