best battery for dual bat

[Ryno78 Junior Member Find all posts View Profile Close Ryno78]

Optima yellow top or std deep cycle???? any advice would be appreciated?

[Pete67 Junior Member Find all posts View Profile Close Pete67]

I bought a Century marine battery which is 750cca and 100ah. I wanted to use the second battery as a backup starter battery in case of an emergency

It was suggested to me to buy a marine battery as it is built tougher to take the jolting and jarring which is associated with 4wding. I don't know how accurate this is and I'm sure plenty of PP peeps will disagree but so far it's been a very reliable battery.

[Wannabe Junior Member Find all posts View Profile Close Wannabe]

I went with the yellowtop. It seems to be the same for durabilityas the Optima marine blue top.
Mainly to keep weight under 20kgs - worried about the dreaded guards cracking.

[MDSimpson Advanced Member Find all posts View Profile Close MDSimpson]

Ryno,
I have been there too mate. Bought a Century deep cycle, flooded wet cell battery.
Worked ok, but we not good enough to run the fridge in the car, with short trip driving, so swapped it out for a Gel 100Ah. Not sure why, but Gel or AGM batteries last longer on a charge than flooded wet cell.

Yellow top Optimas seem to be good, with good reports,

Korr Lighting have a Special offer, 100Ah AGM delivered $250 will fit in N70 tray. They also have 120Ah AGM delivered $280, think it is same size.
Spoke to Cameron yesterday, they are heading the Maitland camping show this weekend.
Just enter pradopoint in the checkout..


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[Ryno78 Junior Member Find all posts View Profile Close Ryno78]

Thanks Pete, cheers Mate

[Ryno78 Junior Member Find all posts View Profile Close Ryno78]

Cheers MD, might look at one of thsose, Cheers Ryno

[Yibbitta Lurker Find all posts View Profile Close Yibbitta]

I have the Optima Yellow top D27F and it will run the Engel 40 lt at minus 5 for 48 hrs without a problem.

[downunder Find all posts View Profile Close downunder]

I went the lifeline 100a AGM, I had these for 3 years in hilux and put the same in the prado. Go either lifeline or optima stay away from the cheaper batteries.

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[Schniff Member Find all posts View Profile Close Schniff]

I've got a supercharge allrounder. Rated at 760 CCA but I tested it and got 860! It is also rated at 105 amp hours. Cost $200ish.

[D4D Addicted PP Member Find all posts View Profile Close D4D]

I've got a supercharge allrounder. Rated at 760 CCA but I tested it and got 860! It is also rated at 105 amp hours. Cost $200ish.

As you're running a D4D if you don't have an alternator voltage booster you won't get much life out it...

[drivesafe Senior Member Find all posts View Profile Close drivesafe]

Hi Schniff, and D4D posted, they will have a short life but you can dramatically improve their life span by getting a battery charger with a Calcium/Calcium setting and use this every month or so and you will not only improve their life span, but it will also keep their usable capacity high.

BTW, using a battery charger on the same setting on your cranking battery will also improve it’s life span and stored capacity.

Even with low operating voltages, the Optima Yellow Top is probably the best battery to use as an auxiliary battery.

Their main advantage is their ability to take VERY high recharge currents.

So if you use a fair bit of power while camped, you can replace the bulk of the used capacity in a very short driving period.

NOTE, Calcium/Calcium batteries are also capable of high recharge currents, while nowhere near that of an Optima, it is 1/3 faster then a conventional flooded wet cell.

[Schniff Member Find all posts View Profile Close Schniff]

I have a voltage booster and it gets 14.1-14.5. We'll see how we go.

[drivesafe Senior Member Find all posts View Profile Close drivesafe]

Hi again Schniff, the boost is a major advantage but Calcium/Calcium batteries still like that periodical high voltage charge.

This is usually 15+v.

It also takes up to 10 hours to fully recharge a low battery, which means you are never going to achieve this while driving.

[Schniff Member Find all posts View Profile Close Schniff]

Hi again Schniff, the boost is a major advantage but Calcium/Calcium batteries still like that periodical high voltage charge.

This is usually 15+v.

It also takes up to 10 hours to fully recharge a low battery, which means you are never going to achieve this while driving.

I'm a bit confused. I thought the Supercharge all rounder was a lead acid battery?

[drivesafe Senior Member Find all posts View Profile Close drivesafe]

Hi Schniff, if you mean is the Allrounder is a flooded wet cell then yes it is, as ALL Calcium/Calcium batteries are.

Note, contrary to many of the claims made about fully charging batteries while driving, most batteries, in a low state at the start of a drive, will take far longer to fully charge them than the length of time most people drive for.

There are some exceptions, like Optima batteries.

If you have an operating voltage of around 14v, an Optima can be charged from dead flat to a fully charge state in under 90 minutes, using nothing more than your alternator.

So with low operating voltage Toyotas, add one of LeighW’s fuses and you have a rapid charge system for only a few dollars.

It not only pays to look at all the options available, but you can save a fortune and still have the best charging system.