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3 batteries or 4?

I think next time I need to replace my batteries (currently 4) I will only purchase 3 and save some cash.

My thinking is if one battery goes bad it can ruin the other good batteries so I only ruin 3 batteries instead of 4

Answer this question I have this problem too

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Four batteries are always better for many reasons. The more cranking amps available make the starting system work more efficiently and quicker. More battery power allows you to run accessories such as small inverters, TV's, stereo's, fans with out having to worry about dragging your batteries down and compromising your cranking ability. Your talking about a hypothetical situation with a battery going bad. If you are watching your batteries you can usually catch a battery going bad before it craps out, they will usually show signs of loosing water and acid leakage at the top and if one starts going bad it will give off a rotten egg smell. It's a good habit to pull your battery box cover every time you get your truck washed and have your batteries steam cleaned to prevent acid corrosion which allows a visual inspection of the battery group. I would say that the batteries are probably the most neglected part of a truck because people usually put them in and forget about them until they start having cranking problems which can be prevented by steaming them or at least washing them off periodically and visually inspecting them for problems. 4 is always better than 3........ ''italic text''

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Most trucks come with 3 batteries. It all depends on what load you have on the batteries. If you are running an 1000+ watt inverter, then having 4 batteries is not a bad idea. If you have a standard trucks with standard accessories, 3 batteries will suffice.

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When I had my 1997 Freightliner with Detroit 60 series engine it came with 3 batteries, the previous owner had spec'd it with 3 to save weight. But the engine was hard on batteries when cranking, so I would usually have to replace them every 6 to 12 months. I added a 4th battery and it would crank easier and they would last me at least 2 years. You could tell the difference. If you have a microwave with a a/c inverter, then you will want to keep 4. If you are worried about cost, goto Sam's club to get your batteries. They will come with a warranty, which will be prorated on how old they are; or a Interstate Battery dealer will do the same thing.

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take a look at www.maxwell.com

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Going with the higher cranking amp batteries they have thinner plates in them and they have tendency to break lose inside and then short out if you stay with one batteries that compromise on the starting/deep cycle batteries which is around 700 to 800 cranking amps the plates in these batteries are much thicker and don't break lose inside as easy so they hold up better.

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I would go with flooded lead acid batteries most likely you are running group 31's The best 31's will be 1,000 to 1,100 cold cranking amps. When buying batteries replace all of them at one time. Check the date codes on the batteries and make sure they all have the same date code. Group 31's should come in around $90.00 to $110.00 a piece. Use a carbon pile battery tester Not a cheap piece of junk the loses it's resistance when you test high cold cranking amp batteries. A new set of batteries should give you a three to four year service life. I'd go with 4 batteries if you run a lot in cold part of the country.

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Go with 4 group 31 batteries, or if you must go with 3, get the Maxwell Ultra capacitor. You'll get longer battery life, easier starts and overall better reliability vs 3 conventional batteries. Make sure you not only have enough cranking amps, also make sure the battery has a high rating for vibration resistance.

I'd also suggest you have your electrical system checked and your alternator and charging system tested when you have the batteries changed. There are plenty of things that cause dead batteries and you should know what causes them on your specific truck.

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