I found this deal for Tello batteries. They appear to genuine Ryze FULLYMAX batteries in a Tello blister pack. The price is $10.99 USD and shipping was reasonable. I order them and received them in 4 days. I was very pleased with the service and price.
here is the link; Ryze Tello Flight Battery
~Bill
here is the link; Ryze Tello Flight Battery
~Bill