Can I use a BTG 3.7V 750mAh 35C in my U818A-HD Quadcopter? Someone suggested getting a more powerful battery as opposed to adding batteries in parallel connection.
By looking at what you indicated, they look similar. However, no dimensions are indicated on the web page so there is not way to actually compare without buying the batteries. The seller information that is indicate on the web page, is not accessible in any way that I can see.