Marine batteries

Any particular recommendations of make/model/particular models to avoid? Single battery setup 90 Yamaha

I've just got a Calcuim Battery and keep it on trickle charge all the time. It can sit for 6 months during the winter Run a 130 HP Johnson. the gel Batteries are good but expensive, but is all relative

Don't know where you are but look at these guys HCB Technologies Limited
You may live where they have a branch.
They only carry top brands.
I just put one of their Ultra Calcium batteries in my car - yeah I know not a marine application.
Expensive but will give long life.
They also carry Endurant (Hella) and Panasonic amongst other brands.
Again not a marine application but had a very good run from a Panasonic in a vehicle.

Do outboards produce enough volts to keep a calcium fully charged? Pretty sure my Dads yamaha 90 regulates at 14.2.v and thats only 3-4 years old.

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I don't bother with the flash harry ones, I just use an Exide Marine Battery. Been there 5 years so far and all good, touch wood.
It does not get babies, Stays in the boat thru winter and I give the boat a run in a bucket for 1/2 hour every 4-6 weeks. No idea if it helps but so far as I said so good

But I also run 2 battery's so have "plan B" if required.
One of these (and on special at the moment)
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@distant stalker get an Optima Marine battery.
They are a dual purpose battery, made to handle starting and deep cycling. Highly recommended.
1 thing you don't want is to be stuck offshore with no power.

Calcium batteries need fancy chargers to be properly charged. I got my charger at trade and it was still about $200 from memory.

Just replaced my orig calcium battery in the boat and it went close to 7 yrs