You can check how much the battery pack is charged by checking how the CHG (charge) indicator lights up while the battery is charging.
CHG (charge) indicator showing the remaining charge of the battery
|Lit||Battery pack charging.|
|Unlit||Charging has completed.|
|One flash at 0.5-second intervals|| - The temperature of the battery pack is outside its operating range (approximately 0 – 40 °C (32 – 104 °F)). Remove the battery pack, warm it or let it cool down, as necessary, and try charging it again.|
- Charge the battery pack in temperatures between approximately 0 °C and 40 °C (32 °F and 104 °F).
- The battery pack is damaged. Use a different battery pack.
- Charging has stopped because the compact power adapter or the battery pack is faulty. Consult a Canon Service Center.
When using the CG-800 Battery Charger, an ambient temperature between 10 °C and 30 °C (50 °F and 86 °F) is recommended. For safety reasons, charging outside of the recommended temperature range may result in considerably longer charging times. Charging will not start if either the battery or ambient temperature is outside of an approximate 5 °C to 35 °C (41 °F to 95 °F) range.