Please note that the LED lights on the charger indicate the status of battery charging. When the red light on, it means the battery is charging. When the green light on, it means the battery is full-charged.

You don’t need to run out of battery to extend battery life, lithium battery has no memory effect. If you don't use the battery for a long time and want to store it, we recommend to keep 50-70% power for maintenance.
  

Yes, fully charging the 2.0 Ah battery may take up to 60 minutes. And fully charging the 4.0 Ah battery may take up to 120 minutes.

It depends on the tools you are using with the battery and the operation mode you choose. For SnapFresh cordless leaf blower ,2.0 Ah battery can last 15 mins for high-speed mode and 25 mins for low-speed mode. If you choose 4.0 Ah battery, it will be 25 mins for high-speed mode and 45 mins for low-speed mode. You can observe the charging status and battery level through the power indicator at any time.