Anyone have any experience with these? I just rewired my MotorGuide 12/24 volt trolling motor from 12V to 24V to get more power (that is DESPERATELY needed). In doing so I will be pulling power from my starting battery instead of just the trolling motor battery. I did not want the expense, and more importantly, extra weight and lose of storage space of getting a third battery. I know it's not the best for battery longevity running a 24V motor this way, but I'm OK with that. What I'm not OK with is running the starting battery dead and being stranded. So I ordered one of these from Amazon yesterday. I got the 8000mAh one. Reviews have people starting 4.8L V8s and Tundras with it, so it should be more than enough to jump my 1994 50/35 Johnson jet if need be. It'll live in my wife's car who recently took a job that involves a 1-1/2 hour drive one way, just in case she needs it, and get thrown in the boat when needed.
https://www.amazon.com/DBPOWER-8000mAh-Portable-Starter-Battery/dp/B013UJ2JDS/ref=sr_1_5?ie=UTF8&qid=1459870346&sr=8-5&keywords=portable+jump+starter
https://www.amazon.com/DBPOWER-8000mAh-Portable-Starter-Battery/dp/B013UJ2JDS/ref=sr_1_5?ie=UTF8&qid=1459870346&sr=8-5&keywords=portable+jump+starter