Wiring Batteries in Series and Parallel.m4v

[@moosesnWoop]

When the title includes the video format, you know a) its old school b) it works c) the only tutorial you'll need

[@bernardonokohwemu1428]

Great simple explanation. Couldn't have been better than this. No unnecessary confusing and helpless techno- show words or expressions, Just pure practical teaching. Thank you friend. Couldn't help but subscribe.

[@greybeardnharg3992]

This video is an exceptional tutorial of how series and parallel work, with visuals! Well done!

[@Hartcore11]

It is good that you provided the simple, but informative way to properly connect batteries. Good job on the video.

[@jumpers3]

Hi,I'm sorry I didn't get back to you sooner,we went camping in Maine.I plugged the fridge into a killawatt,on startup it uses .93 amp and 83 watts.The marine battery has 675 marine cranking amps,105 amps,and 182 minutes reserve capacity.On the frig the only reference to amps is 1.4 amp input current.Thank you MrDavey,this will be a great help to my family.Rob

[@ChicharonyPresidente]

Yes, you can. You can do the two 12 volts in series. You do need to keep in mind the amps you are drawing and the capacity of the batteries for your application. Two batteries in series will double the voltage but will keep the same amp hour capacity.

[@dsdsmitty2]

Exactly the thing I was looking for and it was great that it was no longer than five minutes! Thank you, thank you!!!!!

[@jublywubly]

Nice, simple explanation of series and parallel configurations. I learned this in highschool electronics class, but forgot what the difference was and completely forgot about the amperage adding up. Thanks for explaining it for us all. :-)

[@sugarbearwhite536]

P

[@twilightprod]

The terminals in the video are M6 (They take a 6 mm metric bolt) They came with the batteries. The NB Terminals on your batteries require a small nut and bolt which should come with the batteries, and a ring terminal. Secure the ring terminal to your wire and thread the bolt through the holes in the NB terminal and ring. I hope that helps.

[@Nvmmmmmm1102]

E

[@GeraldPUR]

This video has aged well! Thanks!

[@bluntswithrickybobby]

This helped me so much!!! Going to be adding more batteries to my van so I can power the AC better in the summer. Thank you so much!

[@yoyo54314]

best video about the subject on KZbin

[@Erniesworld]

Awesome explanation, you covered it all with excellent video quality and visual tutorial. "Thats the proper way to make a "How To" video. Thank you

[@bregzstuna9075]

thanks so much for this video was having problem installing a 24volt system.after watching this video I'm ready to try again .. ... ..

[@christianolea2181]

Thanks for this simple and informative video. I do have a couple questions that aren't really addressed in these type of tutorials for the series-parallel configuration. Firstly, from which terminals should I connect a charge controller and/or an inverter? And second, can DC circuit breakers be used in place of fuses to protect the batteries in a LiFePO4 battery bank? If anyone can help clear this up for me I'd greatly appreciate it.

[@umxrr8677]

This is what i have learned: Connecting in series : increase volts but same amperes Connecting in Parallel : increase amperes and same volts

[@mds1986ms]

Correct and remember with parallel to keep wire lengths the same. If you have uneven lengths the shorter set with lower resistance takes the bulk of the work cause heat issues. Especially important on low voltage high amperage DC circuits. Very important.

[@artjiblaframes.7190]

Is there a way it can be all connected that I will still get my 48volts with 21Amh ?, then will that be harmless for my e-bike which should be just 48volts 20Amh ? Thanks.💞

[@skywalker859]

Bunmi Ajibola Instead of each battery being 12v they’d have to be 24v.. Pair of 24v batts = 48v Add another pair, wire in parallel and then you increase amps and runtimes

[@jemsncrystals]

*Best video demo. But why dint you hooked up an amp meter to show the current as well?? It was almost a perfect video than those boring classes*

[@NGELO9657]

Great video, extremely easy to follow.

[@etrnlcoca]

Nice! Within four minutes I understood the basics of series and parallel. Thanks for such a well done video!

[@amokutoheti599]

❤ That's what I am searching for. Trying to build my power bank at home.

[@besthandbook8305]

Without wasting the time, and to the point Marvelous Marvelous Marvelous

[@Erniesworld]

Covered everything except where to connect to .... do you use a positive from one side and negative from the other or do use positive and negative from just one battery at the end because I was told if you do one battery at the end it will drain that one battery faster but it would’ve been nice if you showed where to connect your device to, in my case and electric motor. Great explanation of series versus parallel it helps, thank you

[@MarkDeanMD]

I had same question. In Parallel, Pos1 to Pos 2 to inverter/motor positive. Neg2 to Neg 1 to inverter/motor negative. kzbin.info/www/bejne/eWeWemuMiZt2ftE

[@manuelsalgado8510]

When doing solar panels which option is better? Parallel or series?

[@greasyamado]

Excellent video and to connect 8? A 24v increasing amperage would be the same?

[@gregg2742]

yes you can wire 4 12v in parallel and increase the amp capacity the volts stay the same .. in series the volts add up 12-24-36-46>> the rc( reserve capacity also climbs ) so a series 3x12=36 rc per battery is say 140 you have 3 batteries in series then you have 720min

[@tic2394]

May you kindly state the advantages of each setup and disadvantages thereof Thanks

[@DRAEK05]

They serve different functions. The first example was to increase total output. 2nd Example was to increase run time.

[@mybrotherkeeper1484]

@@DRAEK05 so you’d be able to run a 12 volt DC heater twice as long with series, but a 24 volt DC heater would be ran if the batteries are connected in parallel?

[@mybrotherkeeper1484]

@@DRAEK05 oops, I got it backwards

[@elocore1702]

This is a great explanation thank you, but i do have one question, will you be able to charge them all at once or do u have to do it individually?

[@artjiblaframes.7190]

It is painful answer has not been provided for this your question, that would have been a great help for my planned 48volts 20Amh battery now.

[@frankfrankmusyoka8050]

According to my research ....the bet way to change for more than 2 is to arrange in series

[@CloudWalker54]

@@frankfrankmusyoka8050 I've got an old 24v bus that I'm doing up ... retaining the 24v system including HUGE inverter. My solar controller is auto selective 12/24v & Im using 4 household sized solar panels & 4 truck batteries, wired in parrallel. No good using deep cycle batteries because I require the crank amperage! Truck maintains charge when rolling. Generator for emergencies only. So I'm 240v constantly (inside) & 24v for the mechanics.

[@Sputz3]

Just like charging a golf cart. All at once.

[@r.dineshkumar3984]

As per my knowledge you no need to charge separately ,do it all together

[@ChicharonyPresidente]

There are some gaps in your question. How many volts is the panel putting out? You want to match the volts that your panel is rated for to the volts of the batteries. In a car, the alternator charges a 12 volt battery at about 14.4 volts or so. you need to match the panel's voltage to the battery or batteries voltage in the same manner. Too little and it will not fully charge, too much and you can damage the battery.

[@TheRealKirkHammett]

When wiring two 12volt batteries in parallel to be used in long term applications, do you recommend adding an in-line fuse between your positive jumper wires on the batteries?

[@BluechewRudy]

Where do leads come out?

[@whitepen]

Thank you for the tutorial 0:50 how come you did not get shocked ? I saw you short-circuit the terminals using your body

[@fahadashrafofficial]

Because it's DC

[@josefaschwanden1502]

@@fahadashrafofficial no, because its low voltage, DC kills too.

[@Diozark]

When you connected the two arrays on parallel, where would the load connections go? Which two terminals?

[@lazarusramaube8291]

First and last Batteries

[@Xxxcappie23]

great vid, what would the voltage be in the last configuration with series and parallel between the positive and negative when connected . Will it stay 24v or will it be more?

[@adigrimlock]

approx. 24 V cause 24V || 24V = 24 V.

[@BuddyWhoDoesStuff]

Very informative. I was trying to make a 36v battery to test a motor and it would not work. Thanks a lot. Now I need to figure out if my 36V charger is working.

[@owentduggan8966]

(at 1:15) In this method as shown, you touch the positive terminal with one hand and the negative with your other. Doesnt that complete the circuit and give you a jolt?

[@Llama_Dhali_G]

Do volts or amps kill you? So, back to which kills you, the amps or volts. Given your body is a constant resistance, it really is a combination of both. Higher voltage means higher amperage, and thus higher voltage has more potential to kill. It takes only 100mA to stop your heart. Dec 29, 2003 ~> 2020/20/06

[@sschiffbauer]

Thanks for the instructional video. I would like to install additional battery or two in my vehicle so that I can operate my laptop while the engine is not running. I'm guessing they need to be configured in parallel for this application, correct? Do you know if the car will charge the additional batteries properly while the motor is running? Thanks!

[@davidkimmel1145]

They need to be in parallel and whether the car will charge it or not depends on the limits of your alternator. Also, you should have a good understanding of the load your wiring and fuses can handle before attempting this in your car. The gage of the wiring has to be thick enough to safely handle the additional current. If it really matters, you can reduce the current to your other everything but your laptop circuit with resistors, but I think a better idea is to replace the battery with the max amps your car manufacturer recommends, then use a 120 v convertor instead of common 110, and install a small UPS. The higher amp battery and 120 convertor will charge it while you drive, and then you can turn it off until needed when car is off and you are using your tech.

[@shanelliot183]

I have 4 12 volt Batteries on a 12 volt Solar system. 300 watt panels and a 30 amp charge controller. I am wondering if I can run the 4 batteries parallel like the gentlemen in the video above, without frying the charge controller, etc. Thanks alot.

[@khalifahgaming1308]

Why negatif with positif not explode...

[@danjones5443]

Thanks for the video. My question is? I have 4 one hundred amp hr batteries wired in parallel now. If I were then this way I’m going to end up with 24v on the parallel + an - end. I’m going to have to install a converter on my 12v lights etc correct? Thanks

[@Philiam1973]

Thanks for the demo. I've been trying to find a video for this. Is it possible to link 3-4 12v batteries together and keep the voltage at 12v so I can use a 12v automotive type AC power converter? Also is it possible to use the 24v array and use a automotive AC converter or would that overload it? Thanks againfor the info.

[@assog5737]

Shit I have 14 batteries in parallel. With 6 100w panels. It's been 5 years with no problems.

[@kazuki1906]

Questions what will happen if you connected straight line to positive and negative

[@twilightprod]

To keep 12 Volt batteries at 12 volts, wire them in Parallel + to + and - to -

[@bjl1000]

BS.

[@slidinsidewayzproductionss7906]

Hahaha

[@camit6237]

is this true or are you trying to burn someones equipment?

[@ernestoramon3700]

@@camit6237 it is true + to + and - to - keeps at 12v is how semi trucks run on with 4 batterys.

[@heavysnow8616]

No it’s correct information. Look it up on a different site if you don’t trust the video. I will tell you this: any different answer than the one found here is wrong. Retired 36-year electrician.

[@kevingee4294]

Which pos/neg leads would you use for controller/inverter?

[@TheSteelArmadillo]

Best explanation I've ever heard.

[@parker-crew8588]

how would you connect your controller and inverter to this configuration?

[@filbyfamily]

The last battery configuration, does that make 48v battery if you take positive and negative from two outer batteries?

[@doodnauthlall6951]

You have help me figure that out in such and easy way…. Great job thanks 👍

[@sajanmalhotra805]

Thanks for this video its help me for my project.

[@ainazdaniel9832]

Nice video, how to connecting Parallel and series together

[@sharikosatia]

I learned that you shouldn't connect + to - directly or it will short the circuit and damage the wires. so when he connected them in parellel why didn't that happen? I have tried to connect + to - terminals once on car batteries just to see, there were sparks.

[@MrSerella]

+sharikosatia because he isn't completing the circuit on any or all of the batteries. 1- to 2+ is just a link, had he also done 2- to 1+ then the circuit would be complete and with nothing to take the load it would be a short.

[@sajanmalhotra805]

Thanks for this video its help me for my project

[@ChicharonyPresidente]

Small in size but powerful in nature is what the ideal battery would be. Look for batteries that have the amp hour rating to suit your needs. The more amp hour a battery is rated for the longer it would last. All other items kept equal. Solar power applications are best suited for the "deep cycle" type batteries.

[@flashbodie1]

simple and complete explination, thank you very much.

[@JohnLee-or5bm]

Isn't parallel all negative shooked together and all positives hooked together?

[@Silvermeow]

if i am just trying to extend the use of something that uses batteries, which do I chose so it extends the time but not the output?

[@lukesakail9101]

Clearly outlined...love it

[@camit6237]

which battery dies first if any of them was going to die or get old first?

[@mangreat71]

Im trying to use an small electric hair dryer to keep my car warm esp in the cold.But i need some assistance doing this like in this video using a power inverter.I 1want to use the hair dryer for around 4hrs straight ?

[@mybrotherkeeper1484]

Great real-life question; unfortunately, I don’t know the answer.

[@sabatotangredi1580]

Hi,where do you put the +and - line to hook up the inverter (24v)for not wanting for not putting a lot of strain on the bank...

[@qcdavis2388]

Can I run 4 Six volt deep cycle batteries in Series and Parallel to achieve a 24 volt bank and double the Amps ? So in Series my 4 -6 v bats maintain the 220a/h 's an by adding Parallel this will double to 440 or 880? Thanks !

[@olukoyaolusholaodunayo6653]

good work. how can i connect this to my UPS?

[@davidhudson5281]

will the parallel wiring only work for extending the run time through double the amps?

[@rejaulalam908]

Which setup give best backup

[@davidjames9935]

A few comments: Doubling the Ah rating of a battery bank does not double the runtime. The runtime of a constant "reasonable" load of 4 of your batteries (24V) verses 2 of your batteries (also 24V) should be about 220% runtime, not 200% runtime. This is because the 4 battery bank "sees" a relatively lighter load. Another example is your 12V 18Ah batteries are probably rated at the 20 Hr drain rate. However, at the 40 Hr drain rate, they are probably rated at 20Ah since that would require a lighter load. So my point being that the Ah rating of a battery is not a constant, but rather a function of the load on it. The industry standard is using the 20 hour drain rate which may or may not be representative of what it will be used for. For example, in a golf cart, the 20 hour drain rate specification is not very useful since the cart will not last 20 hours when used. A more accurate number for that application would be the 2 hour drain rate so a golf cart battery rated at 210Ah for example (20 hour drain rate) might only be half of that at the 2 hour drain rate ( 105Ah equivalent). Also, for jumpers, it would be better to have a "neutral" color like yellow or white to indicate they are jumpers and not wires that need to go strictly to negative or positive. It makes a series/parallel setup easier to look at and understand quickly.

[@Asadullah21]

+David James Please help me understand. So there are 2 ways to connect batteries. 1. IN SERIES: only increases voltage. 2. IN PARALLEL: Increases Amps and Voltage at the same time. is this correct? thank you!

2. IN PARALLEL: only increases voltage .

[@davidjames9935]

***** Well it depends. If you connect a 6V battery in parallel with an 8V battery then what would it mean the voltage stays the same? Same as what/which? It depends on many things including load, where you check the voltage at, the state of charge , how the batteries are connected.... Also, there is such a thing as series/parallel (combination) hookup. For example, if you had four identical 12V 150Ah batteries, you could wire them in series/parallel for 24V 300Ah. I used to do that when I had those batteries and also had a 24V 36A (max) charger. Worked well.

[@abbason5064]

maybe you can help me out , I use a electric wheelchair that calls for 12v sealed acid battery am I able to add a 6v sealed acid battery and push 18v my moters?

[@davidjames9935]

Yahshua Worshipper - Are you sure it is only 12V required? If you are sure, I would try 14V first to see if there is any difference. You would then likely have to use a different charger. I have used a 6V and an 8V battery is series for 14V for projects and it works well but I have a special charger for it since a 12V charger will not work on a 14V bank. The charger will either already think the bank is fully charged (when it is really not), or it will stop the charge prematurely which is bad for the batteries. However, there are easy ways to charge a 14V battery bank. What is your goal with more voltage? Do you want the wheelchair to go faster?

[@freedbylove]

I intend to buy 6 6 volt batteries, and hook them up together to a 100 watt s panel and a power regulator , but what i do i do to connect them all to the power manager once they are are hooked up, i cant find any videos on that that are clear to me and none on how you should hook up 6 volt batteries to each other, like does it matter if they are wired to produce 12 volts vs 16 or whatever? What's the best set up? Any videos on this?

[@DrDre-sy2kv]

great simple helpful. now i can increase both top speed and range of my EV. just tell whether we can charge the final set of series-parallel together? if yes then how ? please explain

[@aaronbones4290]

Exactly thats my question too

[@aristidesroman435]

In the 24v where you hook the battery charger or cable to the inveter???

[@jacknicholais7216]

I have a deep cycle battery that is a 12V system and hooked up to a travel trailer with an inline charge. Can I hook up two batteries like this to give my trailer longer life when running off the batteries, or will the added voltage blow everything out?

[@rc6147]

Wire the batteries in parallel, not series. and that will maintain 12v and give you double the amperage.

[@rwdyer2263]

clear explanation thank you. question: I have two 12 volt car batteries but want to slowly integrate (due to cost) some 6 volt deep cells into my system and eventually phase out the 12Vs. Can I add two 6 volt batteries to my already 12s that are hooked in parallel? How?

[@elove808]

why not?

[@ericbaksin8108]

rick d The important thing is supplying enough amperage or current to provide a steady flow of clean power to avoid spikes and low current. I would consider a power capacitor in line to regulate the voltage whether you run 12 or 24 volt systems.

[@charlesadu9221]

good

[@joeestes8114]

Excellent tutorial!, thanks for sharing!

[@Light83]

in your last setup in the video you doubled the amp, but what about the Voltage please?

[@ishmaelpatel893]

So is Parallel better for welding?? More amps righ?

[@BusyB07]

Whats the point of adding the final 2 wires to run it parallel?

[@vemacrinnon9752]

Very helpful and well explained. Thank you.

[@donnasaunders4220]

Cool can I use a 12 gauge wire on 12v 12ah battery to charge controller or should I stick with 14 gauge?

[@dhansel4835]

Can you connect a 12 volt battery to several UPS's? Each UPS will want to charge up the battery(s) but will they conflict with each other trying to charge up the battery?

[@__x.x_maddie_x.x___983]

If you are trying to run multiple ups. Off one battery i would put a switch on the positive cables of each ups to prevent conflict during charge basically keep one on and the others off then when power goes out simply flip the switches and unplug the others from the wall incase power comes back. But you will lose battery power allot quicker . i have an ups connected to my security system and a 12v battery to run 12v 16w l.e.d spot lights

[@dhansel4835]

I wonder if there is a device on the market that will let you do it automatically?

[@__x.x_maddie_x.x___983]

Solar charger with an inverter may be a better less sophisticated option for you . you can get solar panels and a charge controller relatively cheap

[@ritualcustomtattoos]

question : if i want ot connect a mppt battery charger ,should I connect it on the first possitive and at the end of the negative on hte last battery??

[@javiercabrera5098]

how many amp hours would you get from those batteries ? would it be the sum of the amps lets say 7 amps-hours per pack so the series would be 28 ah or 7 amps with just 48v? Thanks

[@bobbyfan418]

I have 3-12 volt (36v) series 31 batteries, powering a hydraulic system in my truck. I didn't build the system, but it's not wired like you do it. Mine are negative to negative, positive to positive, with the power going to the positive on the final battery. Does it matter, and what is the difference?

[@chonjhs]

I am trying to do a solar system setup with about 12-30 batteries for more amps of usage, but since this is only displaying 4 batteries, what do I need to do for that layout? could you please help me out? Much appreciated!

[@mewmewdesigns895]

+Jessica Chon Just gotta duplicate the process over and over till you reach the voltage or amps you want. It's the same no matter how many batteries you use. Just gotta use thicker wire the higher you go.

[@MiK3gamer]

well, if i got this right ... a lightbulb powered by 6V or 9V has the exact same runtime. right? (that's 4 or 6 batteris with each 1.5V in series) but if i wire 2 battery packs with 6V paralel, i can double the runtime without killing the lightbulb. right? because i have some contraptions in mind ... 1. battery-powered light on my bycicle. 2. a usb battery pack with a pretty high capacity for my phone and usb devices

[@williamthomas8135]

So, what kind of battery charger would I need for 3x12v agm ebike batteries? Or is there is simple safe way to hook up a common 12v auto battery charger to these three batteries?

[@kingsiju]

Thanks for your reply. I was able to source for 2 x 6V12Ah. It would arrive in a couple of days.

[@mangreat71]

Can you hook up a power inverter to these batteries even if you have them in series ??

[@theBarefoot]

A parallel circuit maintains the voltage, so wire your 3 batteries in parallel and you'll have dc12v and your amps ramp up. A series circuit maintains the original amps, but increases the voltage.

[@lanthonyperdum6430]

theBarefoot...Finally a simple answer to the question that I’m trying to answer !!!

[@EmmanuelLaku-vl4dh]

Now in this case how do you detect the size of inverter?

[@لاالهالااللهلاإلهإلاالله-ج3ذ]

Hi I want ask you which charge waire using for this battery charging please mention to me

[@drrobotnikmeanbeanma]

Can you just use jumping cables to hook the car batteries in series.Maybe like two different jumping cables ???

[@sparkes999]

hi i have to replace a start motor to a crane was built in the 1940's so it has two 12v batteries connected in series and the positive is the ground/earth. how would i disconnect this battery safely to get to the start motor? any advice would be great

[@setyowibowo6598]

Setyo Wibowo I want to install 24v winch in my 12v truck. Is it possible to make series of two 12v batteries to run the 24v winch while run the car with the 12v? Thanks in advance

[@AnthonyVierra]

Ever get an answer to this?

[@setyowibowo6598]

@@AnthonyVierra swap the motor and the selenoid with 12V one

[@peterjoseph2803]

Hi question will the amps (18) become (36 amps) in this setup. Or remain the same yust getting more running time.

[@StiffLemon]

Linking them in series doubles the voltage, 12, 24, 36, 48 ect. Linking parallel doubles the amps, 18, 36, 54, 72 ect. So 2 in series is 24V at 18A, Hook up 2 in parallel to that and it will be 24V at 36A. (2S2P) Series is Voltage, Parallel is Amps.

[@drrobotnikmeanbeanma]

Will it be better to hook the batteries inseries or parallel cause I'm using them for a 500w ebike. Can I use two of the exact same Scooter/Motorcycle batteries with a 750w Power Inverter to power my 500w ebike ?

[@fixakunmu6710]

can we parallel lifepo4 with lead acid battery? thanks for the lesson..

[@xxkasperxx]

So which is better ?! Parallel or Series ? And what matters more ...the voltage or the amp hours ? I am installing the 400 watt kit to my permanently park travel trailer. Thanks for any advice

[@commonman80]

It Depends On What You're Looking For.. More Power At 48 VDC In Series.. Or? Longer Run Time At 24 VDC In Parallel ... However? More Power At 48 VDC In Series Will Mean Less Run Time.. Approximately? Half The Run Time That 24 VDC In Parallel Would Give You When Wired In Parallel.. Meaning... Do You Want More Power? Or, More Distance/Longer Run Times..

[@kenkoh1724]

Where do I connect the charge control to on the 24v parallel setup

[@slidinsidewayzproductionss7906]

So parallel makes it last longer and series make it more power or is it vice verse

[@dcd2060]

then to which battery do y install my amp left, right left middle , right middle

[@Dominic-nk8lc]

Wires are not too skinny for 24volt series please let me know what type wire I need for parallel wiring Thanks

[@memogarcia78]

If I have 2 12volt batteries in series can I charge them with 24 volts? or I have o charge them separetely with 12 volts?

[@tracerhax]

Yes you can charge them with 24v supply too....

[@aruark6029]

Hello, can you help with this problem, I'm getting an big ARC when connecting the the last connection of the battery bank ( 8 6 volt batteries ) in series and paralell. the panels are not connected yet, just trying to get the battery bank hooked up, should I charge the batteries up before I connect them together and can I charge them together or one at a time I only have a car charger The batteries are all new and reading about 6 volts each Thanks Al

[@craignehring]

+Al Ruark Thought I'd comment on your situation. An arc would indicate that one of your battery "packs" is trying to flow power into the other. The problem is for batteries in parallel, even if it were just two six volt batteries and one of them were weak, the stronger battery would discharge into the other. For sure start by fully charging them and do a cell to cell voltage test and or a check of the specific gravity of each cell. For the what it is worth department, all batteries connected in parallel should be of the same brand and batch date of construction/manufacture date. If you find one of the cells in poor condition it would be not suitable for inclusion of that parallel pack, that battery is "bad" You can have a battery indicate full voltage but other factors I will not go into here could be the problem. There is a great website called Battery University I recommend to check out

[@Bubelmanen]

So, parallel = positive hooked with positive? and Series = positive hooked to negative?

[@paulweston8184]

Parallel is pos to pos and neg to neg. Series is neg of first to pos of second, neg of second to pos of third, neg of third to pos of fourth. And just to be clear when hooking them up to whatever you want to hook up to. The pos of battery one is your positive hookup. The negative of battery four is your negative hookup. You never ever want to let the positive and negative terminals of a battery contact each other through an accidental wire touch or if the ass end of the wrench you are using to tighten one terminal comes in contact with the other terminal. I did that once when I was a teenager. Wrench went through my terminal as if it were mash potatoes.