Ryobi 40V batteries are designed to be used with outdoor tools, so they're likely to come in contact with dirt, grass, leaves ...

Ryobi's 40V batteries aren't defective across the board, it's merely a good time to go over storage best practices for lithium-ion batteries in general.

The best cordless leaf blowers make it easy to clean up any size yard without the hassle of a cord. ... Best Cordless Leaf Blower Overall: Ryobi 40V HP Brushless Whisper Series Blower.

Ryobi 40V batteries are designed to be used with outdoor tools, so they're likely to come in contact with dirt, grass, leaves, and other outside debris, which they are typically equipped to withstand.