## Common ground
Both are portable devices designed to store and deliver electrical energy to charge electronic devices.
## Options at a glance
**8501.71 – Solar power banks**
- **Defining trait:** Powered primarily by solar energy via photovoltaic cells.
- **Typical examples:** Portable chargers with built-in solar panels for outdoor use.
- **Best fit when:** Charging relies on sunlight, especially in off-grid or emergency situations.
**8507.60 – Power banks with lithium-ion batteries**
- **Defining trait:** Use rechargeable lithium-ion battery cells as the primary energy storage technology.
- **Typical examples:** Standard portable chargers for phones and tablets using internal Li-ion packs.
- **Best fit when:** The device relies on electrical charging (e.g., USB wall charger) and uses Li-ion chemistry.
## Key differences
| Feature | 8501.71 – Solar power banks | 8507.60 – Power banks with Li-ion batteries |
|-----------------------|-----------------------------------|---------------------------------------------|
| Primary energy source | Sunlight (solar) | Electrical grid or USB charging |
| Battery type | Often Li-ion, but not required | Always lithium-ion |
| Charging method | Solar panels | USB/cable |
## How to choose
- Does the device charge using sunlight via built-in solar panels? → 8501.71
- Is it charged via USB or wall adapter and uses a lithium-ion battery? → 8507.60
## Overlaps & pitfalls
A power bank may qualify for both if it has solar panels *and* uses a lithium-ion battery. In such cases, the **main function or primary charging method** determines the correct classification. If solar is the main feature (e.g., designed for hiking), use 8501.71. If it’s primarily charged via USB and uses Li-ion cells, use 8507.60. The wording does not specify priority—choose based on the product’s **main purpose or defining feature**