The 2nd battery in the 4B is getting a wee bit tired. I've got a 25amp, 7 stage charger & have done a recon on it, but it's not holding charge too well. It's only function is powering a 20 yo, 40l Engel & will now barely supply overnight. What's the best specific house battery on the market? Do I go AGM? I've AC Delco Marine batteries in the boat & they seem OK. Also, someone mentioned that if the battery is being charged (has a solenoid) but not used shortens its life...True or False. Any advice appreciated
Cheers & a Merry Christmas & safe travels
Steve