I recently purchased a silent partner ball machine, and when I first purchased it everything worked ok but the battery would die in like 20 minutes. I went ahead and purchased a replacement battery for it and ever since I have put the new battery in the ball machine can't shoot a slow ball and the spin control seems out of whack. I put the speed on the slowest and the spin on neutral and the ball comes out like you have it set to the fastest speed and the ball stops almost when it hits the ground like it has backspin on it.. On the slowest speed setting I have to move it at least 6 ft behind baseline just to get it in the court. I wasn't sure if anyone else has experienced an issue like this, and if anyone had any suggestions. I'm hesitant to purchase another battery since the battery itself is working, and I can't really switch back to the old one because it dies so quickly. Anyway please reply if you have any experience with ball machines because its definitely not my area of expertise and am just seeking some advice. Thanks.