Replacing Batteries

[Dritchie]

I have a 2015 Cutwater 30 which I suspect that the batteries are tiring and it is replacement time in the Spring. It is a touch laborious to drag a battery out of the lazarette and my dealer is no more so I can not ask them. So please, what is the battery company name, model of battery, and amp hour rating which are installed. They are all AGMs...at least that is what the instruments have been set for over the last five years.
Also, if you have any history, or experience, which battery bank.....engine, house, or thruster, generally fails first? Yes I know that this is a depends question....all banks have been lightly used, in my opinion and shore power connected 7/24 other than when on the hard over winter.
Many Thanks
Doug

 

[asm777]

We're about 4.5 years of use on our batteries and been getting low voltage warnings on our Garmin screen shortly after startup which disappears after cruising for a bit.

Proactively replacing all 6 batteries (currently waiting for the last ones to be delivered) for peace of mind.

Our C30CB had the UB121100 batteries from the factory and I ordered mine from Amazon (direct replacement):
https://www.amazon.com/gp/product/B00VU31TFQ/

I looked at other more expensive brands but for our purposes (mostly short trips to/from slip not extended cruising), don't really require better batteries that can hold charge better/longer/etc.

It looks like Amazon fixed it but they used to show the UB121000 battery (it's smaller 100Ah) as the first result when searching for the UB121100 and I accidentally ordered the wrong battery the first time (good thing I only ordered 1!) so double check the part numbers when you are purchasing!

I'm not looking forward to crawling into the lazarettes to wiggle out all of these 66 lb batteries but it needs to get done! Good luck!