[
    {
        "role": "user",
        "content": "powerbank%20of%2020%2C000ma%20how%20long%20it%20takes%20to%20fully%20charge%20using%20usb%20c%20cable%3F"
    },
    {
        "role": "assistant",
        "content": "It depends mostly on two things:\n\n1. **How much input power your power bank supports** (in watts via USB-C), and  \n2. **How much power your charger/cable can deliver**.\n\nBelow are some examples to give you a good estimate of charging times for a 20,000 mAh power bank under different conditions:\n\n---\n\n### \ud83d\udd0b Sample Charging Times\n\n| Scenario | Input Power (Wall Charger + Cable) | Charging Time (0 \u2192 100%) |\n|---|---|---|\n| Using an 18-20W PD (Power Delivery) USB-C wall charger | ~18\u201320 W | Around **3\u00bd hours** ([help.laserco.com.au](https://help.laserco.com.au/support/solutions/articles/51000507904-laser-powerbank-20000mah-faq-charging-time?utm_source=openai)) |\n| Using lower PD charger (\u2248 15\u201320 W) with a typical USB-C PD power bank | ~15-20 W | Approximately **5.5 hours** for many models ([help.laserco.com.au](https://help.laserco.com.au/support/solutions/articles/51000521184-laser-20000mah-power-bank-faq-recharge-instructions?utm_source=openai)) |\n| Using a high-wattage charger (e.g. 60 W or more, if power bank supports it) | ~60 W | About **2\u20133 hours** or less depending on actual limit ([s3-ap-southeast-2.amazonaws.com](https://s3-ap-southeast-2.amazonaws.com/wc-prod-pim/Asset_Documents/COPB2060_manual.pdf?utm_source=openai)) |\n| Using a weak charger (USB-A or USB-C limited to 5-10 W) | ~5-10 W | **8-10+ hours**, often much more with very low input power ([service.anker.com](https://service.anker.com/article-description/How-to-Recharge-Anker-525-Power-Bank-PowerCore-20K?utm_source=openai)) |\n\n---\n\n### \u2705 Why It Varies So Much\n\n- **Power bank\u2019s input rating** sets the ceiling. Even if you plug into a 60 W charger, if your power bank only accepts 20 W, that\u2019s all it\u2019ll draw.  \n- **Charger and cable quality** matter a lot. You need both to support the required PD level (voltage + current).  \n- **Battery chemistry & efficiency losses** (charging isn\u2019t 100% efficient) add some overhead. What\u2019s advertised as 20,000 mAh doesn\u2019t all become usable during charging.  \n- **Charging speed tapers off** near 100%. Many devices slow down once they reach ~80-90% to protect battery health.\n\n---\n\nIf you tell me which 20,000 mAh power bank you have (model name or rated input wattage), I can give you a more precise estimate based on **your** device!"
    }
]