Battery replacement and opinion

[junglejuice]

With series the resistance is added..

10 + 10 = 20

In parallel it's 1/r, so

1/ 1/10 + 1/10 = 5

So 1/ 1/47 + 1/47 = 23.5

Does this help?

Of course you could just use a single 22k resistor if you like...

[awg]

My starter motor seemed a little sluggish last few starts, so I multimeter this morn and only 12.35V, using this table, action is needed, battery age is unknown

############################################

Battery Voltage and State of Charge:

12.66v . . . . . . . . . . 100%
12.45v . . . . . . . . . . 75%
12.24v . . . . . . . . . . 50%
12.06v . . . . . . . . . . 25%
11.89v . . . . . . . . . . 0%

(NOTE: these readings are at 80 degrees F. Battery voltage readings will drop with temperature roughly 0.01 volts for every 10 degrees F.)
(At 30 degrees F. a fully charged battery will measure about 12.588 volts, and at zero degrees F it will measure about 12.516 volts.)

##########################################

Lucky, go to start and drive to autoparts, and she nearly dead.

Battery MF50 Type 67 650CCA to suit Falcon fits perfectly, and they had it in stock $173, unlike MF58 for Jeep $185 needed order, likewise Century equivalant $250.

The "Jeep" batteries are only rated 540CCA.

Thx to this forum for that info, I had to interogate the Autobarn guy thougroughly before he would cooperate.

At least he was better than the Repco chick, I though she wanted to spit in my face, when I asked the mildest of questions.

I would have got an Optima, but want to get a duel/start/deep cycle setup, at my leisure

[Redemptioner]

You can't go wrong with the yellow top, more importantly you are not F'ing the battery when you run it flat.

With regards to tricking the temp sensor by replacing with a fixed resistance, does not make that much of a difference and certainly won't fix the problem or have any measurable effect on your child issue of flattening the battery. The yellow top will though in a big way and probs allow you to leave the doors open for a couple of days.

As for adding the super CAP's, what a waste of money and time and adds something that is highly likely to fail (fyi capacitors hate heat), going to be real fun when one explodes and shorts and will drain much faster than a battery....

[alexbrown64]

Originally Posted by Redemptioner

You can't go wrong with the yellow top, more importantly you are not F'ing the battery when you run it flat.

With regards to tricking the temp sensor by replacing with a fixed resistance, does not make that much of a difference and certainly won't fix the problem or have any measurable effect on your child issue of flattening the battery. The yellow top will though in a big way and probs allow you to leave the doors open for a couple of days.

As for adding the super CAP's, what a waste of money and time and adds something that is highly likely to fail (fyi capacitors hate heat), going to be real fun when one explodes and shorts and will drain much faster than a battery....

Finally a post that makes sense and relates to the original question. A normal lead acid battery is designed to deliver a short high current burst and can appear flat when its only used 10% of its charge, and hates it. Hence leaving the doors open for a few hours can flatten the battery. A yellow top deep cycle battery can be deeply discharged up to 75% of its capacity and it loves it, and will still start your Jeep.

So, a yellow top deep cycle battery can be a great upgrade for the Jeep and provide a solution to doors being left open, parasitic draw and draining problems, while still maintaining good cranking power and can be used to run the LED camping strips, a radio etc, and still start your car the next morning. And it does this without ruining the battery, unlike a normal lead acid battery that gets a few drain cycles and is toast.

I will considering a yellow top battery on my next upgrade.

Cheers,

[awg]

Originally Posted by alexbrown64

Finally a post that makes sense and relates to the original question. A normal lead acid battery is designed to deliver a short high current burst and can appear flat when its only used 10% of its charge, and hates it. Hence leaving the doors open for a few hours can flatten the battery. A yellow top deep cycle battery can be deeply discharged up to 75% of its capacity and it loves it, and will still start your Jeep.

I will considering a yellow top battery on my next upgrade.

Cheers,

will consider one for my dual battery setup

I always replace courtesy lights with LEDS, never care again about inside lights, its a weight of yr mind when camping, working on vehicle etc.

My white one has 7, which is ludicrous current draw with incandescent

standard crank batteries hate being deep-cycled

[LuluBelle]

I just had to recently get a new battery after trying to revitalize the old one ..youtube vids.. I read that the heat generated under the hood of XJ's shortens the battery life I got about 3 and a half yrs outa the centuary battery hopefully with my hood vents it might keep the battery cooler........ on a side note I had to replace the battery in my PT Cruiser last winter it was 7 years old amazing lots of airflow and room under the hood of the PT I like the led bulb change to draw less power
_____ooooo
/__l_l_,\____\,___
l_---l_l__l---[ ]llllll[ ]
_.(o)_)__(o)_)--o-)_)

[Redemptioner]

I leave my two 40W LED side lights on when fishing of a night, admittedly on an isolated battery. After 4 hours or more of fishing the battery has not dropped more than 1.5v (fridge running as well), the big waeco fridge with both sides on the lowest freeze setting (means the fridge runs way more than normal) will pull the battery down to about 10.9v overnight. Before anyone chimes in, no, the cut off is not coming in because I use a step-up/step-down reg on the rear 12v outputs so that can't happen (constant 12.2v output). I would prefer to flatten an aux battery rather than getting food poisoning or killing someone while on holidays, sure you waste about 8-10% of the energy through the reg but I don't think the sister would be happy if I came home minus one of the nephews....

Another option to think about is a nice little high cranking dry cell motor bike battery for the starter and a cheap VSR to hook it to the other battery, this way you get a good capacity aux battery and a backup for the starter motor. This is how I use to run the zooks and it works well, especially if you are lacking in space.