batteries that can lay down

looking to upgrade the batteries in the boat and it seems the best location is under the rear seats, however this would require laying the batteries on their side. am I correct in the though that something like the optima red or yellow tops would be okay in this case? whats the difference between a standard car batterie and a marine batterie?

thanks gents

Link to Optima site / suggestions.

https://www.optimabatteries.com/en-u...optima-battery

Cranking batt or deep cycle?

Blue top optima it’s a rv/marine battery deep cycle can be mounted on its side. As it sealed.

Marine batteries are built stronger/heavy duty than a car battery to handle the vibration, movement and constant pounding it takes being on the water, they also discharge power differently so that you get the proper cranking amps to start an engine and then slow discharge (deep cycle) to run appliances, electronics for prolonged periods of time, larger vessels will have dedicated Deep Cycle systems and starting batteries for example our boat had 3 Deep Cycles and 2 for cranking engines...one was a backup incase you toasted the first if there was a problem starting. On a smaller vessels you can get away with dual purpose Marine battery which will give you cranking amps and "slow burn" once engine is started...

Don't use a car battery...you will most likely regret it...it will not last long, even if properly taken care of...

anyways, just MO for what it's worth...

thanks for the info.

optima says the red top is for engine starting only. the yellow top seems to act more like deep cycle but they don't really call it that.

been doing a bunch of reading and seem to get mixed ideas, some say that a standard marine battery can be mounded horizontal, others say they cant. if they can that would be best as a standard marine battery is half the price of an optima yellow top and weighs less too

what kind of boat...is there no room to mount on the floor in the transom?

Old Fiberglass. Pretty tight for space. Looked into the optima. And talked to my boat guy. There are a couple marine gell batteries that can lay down. It they all start at 300.

So screw that I’m gonna buy jump pack and forget the hassle.

In my experience Optima batteries are junk. Don't waste your money.

Strong dislike for red / yellow tops because of failure issues.