I have 2 Optima yellow D31T on my boat for TM. So far they are holding good.
Blue top D31M for the motor and electronics. These batteries were in the boat when I bought it. Don't know how old they are but are at least 3 years old I'm guessing.
If I run both lowrance units, LSS-1 and the 200watt sonic hub playing music (4 speakers) with the motor off it will knock the bluetop voltage down to 11.6 after about an hour. Still has plenty of juice to start the Merc.
Edited by Muzzlebrake (06/19/17 10:55 AM)
Infidel and proud of it.
From Genesis: "And God promised men that good and obedient wives would be found in all corners of the earth."
Then He made the earth round...and He laughed and laughed and laughed!