If you're trying to use jumper cables with the new battery, you're wasting your time. Bolt the new battery in, with BIG cables hot and ground, and your slow crank problems will probably go away. Otherwise you're wasting everybody's time, including your own.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!