Here's why:

* Voltage Matters: Both chargers provide 5 volts, which is essential for most devices.

* Current (mA) is the Capacity: The higher the current (mA), the faster the charging speed.

What You Need to Consider:

1. Your Device's Needs: Check your device's manual or the charger's label. It will specify the required voltage and current.

2. Charging Time: If your device uses a 700mA charger, using a 180mA charger will likely charge your device more slowly.

3. Safety: While a lower current charger won't damage your device, it might not provide enough power to function properly while charging (e.g., using the device while charging).

Conclusion:

* If your device only requires 180mA or less, a 5V 180mA charger is fine.

* If your device needs more than 180mA, using a 5V 180mA charger will work but will be slower.

* It's always best to use a charger with the correct voltage and current specified by the device manufacturer.

General Advice:

* Always prioritize using the charger that came with your device.

* If you must use a different charger, ensure it's a reputable brand and has the correct voltage and current for your device.