Have a 2017 Tracker Pro Team 175 TXW w/ 75 HP Mercury 4-stroke that came with 2 batteries -- Cranking & Electronics (2 small Lowrance graphs): Interstate 24M-XHD and 12V Trolling: Interstate SRM-27.
I recently upgraded my TM and Electronics (Lowrance Ghost 24V TM, 2 HDS-Live 12" units and Lowrance Active Target). I added a second Interstate Deep Cycle when I went to 24V (a Interstate 27DC). I also swapped out the original NOCO Genius 2-bank charger for a 3-bank Minn Kota 345PC Onboard Charger, that reportedly supports AGM batteries.
Haven't had any issues making it thru a day of fishing until just the other day. It is possible that I may have forgotten to plug in my charger the night before. But 1/2 way thru the day, I couldn't start the outboard motor. All my electronics were still working. There just wasn't enough juice to get the motor to turn over; it was close. Used the TM to get back to the ramp.
I've took a look thru the various forums here re: similar issues and it sounds like I need to upgrade the a Group 31 AGM dual-purpose battery. Problem is the aluminum battery shelf is along the left side of the gas tank and doesn't appear to be wide enough accommodate the extra length of a Group 31. It currently accommodates the 2 Group 27 plastic battery trays which are screwed to the aluminum lipped shelf.
NOTE: I just removed all 3 batteries and measured the width of the aluminum battery shelf. Looks like it's approx 13.5" wide (see attached pic). I think I found a Group 31 battery tray that'll fit. Battery Tray.jpg
Would a Group 27 dual-purpose battery suffice, or should I try to go for a Group 31? AGM?
Thanks in advance.