RV Repair: 1985 toyota dolphin, toyota dolphin, fuel injection system

Question
My 1985 toyota dolphin has 50,000 miles, has new battery, new starter and
wont hold a charge for more than a day.. has fuel injection system.any
suggestions?

Answer
Your coach has a starter battery and a coach battery. If you are talking about the starter battery not holding a charge it should respond like the battery in your car. If you are talking about your coach battery it should last 3-4 days depending on dry camp use.