Connecting two Batteries.

COP-OUT · Oct 28, 2013

I have an enclosed 4 place trailer. The battery in it is an Interstate deep cycle .I want to add another battery to it. I forgot if you take the positive from one battery to the negative terminal. to the other or is it positive to positive.I have a converter for shore power and when hooked up to the truck it charges the batteries. Plus I have a new break away battery, but don't know it it will charge from just the truck or also the shore power.
Thanks.

meathooker · Oct 28, 2013

COP-OUT said:
I have an enclosed 4 place trailer. The battery in it is an Interstate deep cycle .I want to add another battery to it. I forgot if you take the positive from one battery to the negative terminal. to the other or is it positive to positive.I have a converter for shore power and when hooked up to the truck it charges the batteries. Plus I have a new break away battery, but don't know it it will charge from just the truck or also the shore power.
Thanks.

12V is pos to pos, neg to neg.

6v is pos to neg, neg to pos.

if you hook them up they will balance each other and that could be bad if you end up with a bad cell in your current battery it could prematurely ruin your new battery. there is a way to wire in a device to prevent this but i cannot recall what it is ... not an electrical guy

TheJett29 · Oct 28, 2013

If you just hook neg to pos on one battery terminal on each the result would be 24 volt output.

Neg-neg pos-pos is still 12 volts just more of amp hours (ah)

skibreeze · Oct 28, 2013

You are supposed to only replace batteries as a pair and they need to be identical in capacity.

volcano buster · Oct 28, 2013

skibreeze said:
You are supposed to only replace batteries as a pair and they need to be identical in capacity.

Kind of like tires...

cokecrazed007 · Nov 1, 2013

Load test each battery first, if they pass you can hook them together. Wire them positive to positive, and negative to negative. This will give you more amps and 12 volts, this called parallel.

Sent from my LG-E973 using Tapatalk

Pro-8250 · Nov 23, 2013

cokecrazed007 said:
Load test each battery first, if they pass you can hook them together. Wire them positive to positive, and negative to negative. This will give you more amps and 12 volts, this called parallel.

Sent from my LG-E973 using Tapatalk

What he said...........
When the positive terminals of all cells are connected together and similarly the negative terminals of these cells are connected together in a battery, then the cells are said to be connected in parallel. These combinations are also referred as Parallel Batteries. If the emf (electromotive force/voltage) of each cell is identical then the emf of the battery combined by numbers of cells connected in parallel, is equal to the emf of each cell.
The current (amps) delivered by the battery is sum of currents delivered by individual cells.
If you do the opposite and connect them in series you may have to call your insurance agent after you call the fire department. :mmph:

Search

Connecting two Batteries.

COP-OUT

Well-known member

meathooker

Well-known member

TheJett29

Well-known member

skibreeze

Well-known member

volcano buster

Well-known member

cokecrazed007

Member

Pro-8250

Well-known member

Similar threads