Ryobi 18v batteries: Real vs. Amazon Generic!

Inquiring minds want to know!
~ How long will the leaf blower run on what battery?
~ How much more run time does a bigger battery get you?
~ How does a knock off compare?
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Ryobi Blower: p2180
Genuine Ryobi Batteries: 4ah, 1.5ah, and 1.3AH
Knockoff 5ah battery: www.amazon.com...