04-27-2013, 08:17 PM
I have a Minn Kota 36 lb thrust trolling motor that I use with an Interstate size 29 deep cycle lead acid battery. I assume your 50-lb thrust motor would draw proportionally more amps. The 29-size is a longer battery than the usual auto size 24 batteries. On high speed, it lasts an hour or two, but I seldom use it at higher than low to med speed on my pontoon boat. At those speeds it lasts all day. I tried a store-brand deep cycle 24-size from a well-known big box sporting good store, and it was always out of power before the end of the day & only lasted a year. Its all about the amp-hours the battery is rated. Heavier battery = thicker lead plates. More amp-hours = longer run time.
good luck!
good luck!