Battery problems

[RoMoJo]

I have a 2018 Yamaha 24’ E-Series and when parked listening to the radio the house battery drains down in about 15 min, I took it off and had it checked at autozone and they said the battery was good but needed a charge so they charged it and I put it back on and still the same problem. So dealing with this I’ve noticed that I have 2 start batteries instead of one of them being a deep cycle battery, I called the dealer and they said Yamaha recommends having 2 start batteries but I’m not sure why.
I’m gonna replace the battery to see if that fixes the problem, should I replace it with a deep cycle battery?
Thanks

 

[ZGhost]

I have a 2018 Yamaha 24’ E-Series and when parked listening to the radio the house battery drains down in about 15 min, I took it off and had it checked at autozone and they said the battery was good but needed a charge so they charged it and I put it back on and still the same problem. So dealing with this I’ve noticed that I have 2 start batteries instead of one of them being a deep cycle battery, I called the dealer and they said Yamaha recommends having 2 start batteries but I’m not sure why.
I’m gonna replace the battery to see if that fixes the problem, should I replace it with a deep cycle battery?
Thanks

Looks like this is your first post, welcome to the forum!
There are many threads on the battery topic, do a search and some reading and you will learn a ton. Here is a good recent one:

https://jetboaters.net/threads/school-me-on-batteries-my-255xd-will-get-barely-3-to-4hr-on-float.33425/page-3#post-541227

 

[Dave burke]

Welcome. I’ve never heard a dealer say that you should use two start batteries. Kinda of defeats the purpose of having a start and house battery system.

My boat (2017) came with a cranking and a deep cycle battery. Interestingly the dealer had installed them backwards. Then the cranking battery had to be replaced which the dealer did no questions asked.

i wonder if your dealer is engaging in cya…

 

[David Martin]

No Battery should drain in 15min unless there is a vary heavy load. Most 80amp hour starting battery's being fast charges at the zone....... would be lucky to get 60amps hours before the charger calls it up/full. You must have one thumping radio to pull it down so quickly.

 

[212s]

I have a 2018 Yamaha 24’ E-Series and when parked listening to the radio the house battery drains down in about 15 min, I took it off and had it checked at autozone and they said the battery was good but needed a charge so they charged it and I put it back on and still the same problem.

If your battery is draining in 15mins with the stock system, something is wrong with the battery or a wiring issue causing a massive drain, or like mentioned you upgraded to a few thousand watts and you're pulling large current draws. I have the factory marine starting batteries (85AH) and with a 500w amp and pumping too loud I can run it for hours with the stock battery. A deep cycle would be much better.

So dealing with this I’ve noticed that I have 2 start batteries instead of one of them being a deep cycle battery, I called the dealer and they said Yamaha recommends having 2 start batteries but I’m not sure why.

This is normal...starting batteries are cheaper than deep cycle and the dealer picks them to save money, and the batteries should be matching size and capacity.

I’m gonna replace the battery to see if that fixes the problem, should I replace it with a deep cycle battery?
Thanks

Since the charging system on the boat is designed for matching batteries, it's a good idea to change both to the same deep cycle to maximize performance and battery life.

If you have an upgraded stereo, or even the stock one that runs for many hours, you probably need a battery charger to keep them topped up when the boat is parked.