1. Check indicator light changes (most common): During charging, the indicator lights will gradually illuminate or flash continuously. When all indicator lights become stable and no longer flashing, the battery is fully charged. Some single-indicator models will change from flashing red/red to solid green, also indicating charging is complete.
2. Check via app or display (smart/high-end models): For smart models that support smartphone connection, you can check the real-time charging progress in the accompanying app. A 100% charge indicates a full charge. Models with a digital display will show "100%" or a full-charge icon, indicating charging is complete.
3. Use charging time as a reference: If the product doesn't have clear instructions, refer to the official charging time: Generally, small-capacity portable models fully charge in 3-5 hours, while large-capacity industrial models require 8-12 hours. Stop charging once the stated time is reached.
